Personaly i would like if caching a potion would cost reaction
Interesting idea, but the key here is "catching", which should be different from "consuming" / "drinking". Even in BG3, the latter still costs BA, and BA is unavailable out of turn (should be?..).
Yes, its cost BA when you youreself wish to drink a potion ...
It WOULD cost Action of first person, reaction of second person and still it would have fair chance to do litteraly nothing AND lost a potion ...
Seems like quite fair trade to me.

Otherwise, if 10 Duergars will decide to heal one of them together, sure it will take them all their turns in a round, but the recipient will effectively become unkillable for that time.
That is the most funny thing about this all ...
Concidering that Larian starts to agree with us (and yes im part of this group surprisingly

) and set Shove and Stealth as Action instead of Bonus Action ... and (yes im supporting this idea too) they will remove Bonus Action weapon maneuvers ... what will those 10 Duergars do?
Scenario A:
All 10 Duergars will attack in their turn, or shove ... then, since they are injured they will drink a potion ...
Result? 10 Healed Duergars ... and 10 Attacked enemies.
Scenario B:
All 10 Duergars will throw a potion to heal their comrades ... then ... what?

Result? 5-8 Duergars will be healed ... up to 5 (50% chance) of them will completely waste their turn, since their comrade didnt roll enough and nothing happened, just Action gone.

Scenario C:
All 10 Duergars decide to heal one of them together ..
As Niara allready mentioned ... result will be 1 heal and 9 wasted potions, since that Duergar have only one reaction per round.

Dont be mad at me, if you have any other scenario in mind, please share ...
Even so amazing and flawless (kidding) creature like me can potentialy make misstake, so its possible that i forget something.

But right now ... no matter wich side im watching it ... it seems to me like throwing potion would be the most uneffective thing you could do in combat, IF at least Larian would delete that part where potions have effect if they miss ... after all, that hit chance is in fact substitute for catching roll.

But, catch 22, this would, once again ,require a properly functional reaction system in the game, which we do not really have right now.
Wich Larian is allready working on.

Dont be affraid to dream big.

Even a reaction is too broken.
Reality check. How fast can you drink a flask of anything? Toss a corked flask to someone. Have them pop the cork off and then drink it.
A reaction is meant to be a split second moment. As an enemy is retreating, you seize the opportunity and stab. It is not meant to be you catching a bottle, uncorking and guzzling.
Immersion again, huh?

Tell me, please ... does "catching, poping off and gulping a potion" take more time than
- catch an arrow, call for your body natural magical energy and use it to throw the same arrow to someone with simmilar intensity as if it was shoot out of bow?

- noticing that somoene is casting on you, so you recite your magical formula, do apropriate gestures and surround your WHOLE body in magical shield?

- noticing that somone is attacking you, so you reach your patron and surrounds this sime his WHOLE body in hellish flames?

I mean come on.

And again, it completely breaks the need for a cleric or wizard at all. You can throw potions that work better than spells. What do you need spells for?
[sarcasm]
Why would i take Wizard with me, you know ... the dude that can cast almost litteraly any magic spell that is in the game, including brutally damaging spells, guaranted hit spells, AoE spells, crowd controll spells and most of them is even able to affect multiple enemies, when there is single (again litteraly, since i didnt even found second sleep potion in my last play

) item that i can throw ONCE at SINGLE target and get the same result as one of those spells?
Totally useless class indeed.
Why would i take Clerict with me, you know ... the dude that can curently cast two different heals per run, can ressurect my unconcios friends, give us blessings to boost our combat capabilities, have lots and lots crowd controll, debuffing, and damaging spells ... and also can nicely work as a tank for us ... when i can simply throw a potion that can heal single target only, once per round only, while he is conscious only and wich would take the reaction from him for the rest of that round?
Totally useless class indeed.
[/sarcasm]
[deadly serious reaction]
I mean ... come on.

[/deadly serious reaction]
Wizards and clerics get the shaft in BG3 because of items. Just like Rogues get the shaft because they have no expertise and everyone can sneak as bonus, drink potions as bonus, pick locks with just as much skill, etc.
The game breaks classes. Take fighter. Everyone can perform special combat maneuvers now based on weapon type. So fighter maneuvers are no longer special.
Over and over again, they are breaking down the classes so it is kinda like, who cares what class you pick. It really doesn't matter much.
I agree with premise of this statement ...
But the form seem overdramatic to me. :-/
It feels a little like going to jail for yelling at my dog ... yes we all will probably agree that i should not done that, but its also not so big deal.