GM4Him
Okay, because you seem to be pretty much the only one that thinks the system that Larian set up with potion use renders healers unnecessary and like throwing out wild scenarios I want to issue you a challenge:
I want you to do a complete run of the Early Access content, but with a few rules:
1) The Character you create cannot have healing magic (So IF you make a Druid or Cleric you must prepare your spell list without the healing spells available)
2) You can choose any party make up you like, but if you keep Shadowheart in the party you must like wise prepare her spell list to exclude healing magics and cannot have Gayle learn healing magic. (You may however use the fighters second wind ability and the warlocks ability to regain health on a kill)
3) You MUST do ALL the fights... no using dialog to talk your way out of them or avoid any of the fights. Yes, you can use the dialog to turn the Gnoll against her own pack and you can recruit Gutt to help you kill the Duergar (if you are playing the "good" route) and recruit Brithvar to fight Nere, but when it comes to the oath breakers in the toll house you MUST side with Karlach (since slaying her would mean you are avoiding a fight... unless you choose the slay her and the Paladins...)
4) You may take as many long or short rests as you like.
5) you must record it.
The goal here is that you do all of the hardest fights available with only potions of healing, potions of greater healing and any scrolls of healing you find/buy and PROVE that the potions system implemented have rendered healers as useless as you say.
IF you can get through it all of that with just potions and scrolls, then you have proven your point and are absolutely right, BUT if I am correct... by the time you reach Nere you will be nearly out if not completely out of healing potions making that fight damn near impossible to do even with Brithvar's help. Honestly, I am guessing even with a good stock of healing potions and scrolls available to you even the Githyanki fight will prove to be a hell of a lot harder if not neigh impossible.
Honestly I don't really expect you to take this challenge, but I kind of want you to put your money where your mouth is...
I literally always need healing potions and a healer otherwise we all die because if they healer is hurt I need to heal them and also be aware of spell slots :P