Here is a really simple solution to all this.
Have fast HP recovery as default. This allows for the most playstyles. A group can be made of 2 wizards and 2 fighters, 4 rogues, a monk a barbarian a warlock and a sorcerer, or any combination you can think of without hindering the story. Nobody needs to play a healer, and the DM doesn't need to adjust encounters and pacing for the fact that there is no dedicated healer.
For the groups who don't like fast HP recover, allow them to change it to 1 HP per long rest or 1 per lever each long rest or anything in between. But give them tools for how to deal with slower HP recovery. Inform them that with slower HP recovery, the group will take more long rests between encounters, or that as the DM you will need to hand out healing potions like candy, or groups will absolutely need magical healing. Using slower HP recovery will be more challenging for both the party and the DM, but as long as the DMs know what they are getting into by using the optional slow HP recovery module, this shouldn't be an issue.
Have fast HP recovery as default. This allows for the most playstyles. A group can be made of 2 wizards and 2 fighters, 4 rogues, a monk a barbarian a warlock and a sorcerer, or any combination you can think of without hindering the story. Nobody needs to play a healer, and the DM doesn't need to adjust encounters and pacing for the fact that there is no dedicated healer.
For the groups who don't like fast HP recover, allow them to change it to 1 HP per long rest or 1 per lever each long rest or anything in between. But give them tools for how to deal with slower HP recovery. Inform them that with slower HP recovery, the group will take more long rests between encounters, or that as the DM you will need to hand out healing potions like candy, or groups will absolutely need magical healing. Using slower HP recovery will be more challenging for both the party and the DM, but as long as the DMs know what they are getting into by using the optional slow HP recovery module, this shouldn't be an issue.