You may be onto something but I would much prefer if Aradin was just knocked out if he reaches 0 HP – like any DM would do if they were running the game. Then after the battle someone can revive him with a potion the normal way. They don't need him to make death saving throws... I'm fine with certain NPCs having some plot armor.
I do still think it messes up the balance. I'd rather have Aradin just die than to have the game unbalanced with all of its extremes.
One thing leads to another. Allow potions as Bonus instead of Action, and allow throwing potions, and you have to tweak clerics to make them better healers so they're worth something, which then allows wizards to cast two spells in a single turn which makes them more powerful at higher levels. Also, potions as Bonus negates Rogue Fast Hands special ability's most potent mechanic, allowing Rogues to use potions as a Bonus. So, then to make Fast Hands better, you have to add homebrew to it, or it becomes almost worthless, so they make it so you can do a Second Bonus action, which means Rogue can do 3 attacks in a round with two weapons. This then makes Rogues more effective melee fighters than fighters, so you need to add more fighter attack options to make them more versatile close rangers, thus weapons receive more melee options, and since fighters can use all weapons they now have more options in melee to try to offset the fact that other classes are now pretty much just as good as they are at fighting.
It's a chain reaction that could go on and on and on and on.
