Is it fair to criticise a game for being too hard/easy?

[Conina]

AngryLittleAlchemist said:

Volterra_90 said:
I've always thought that almost any game should have a difficulty setting from the beginning, to adjust to anyone. I mean, if people want a more relaxed experience, go for easy. If they want a challenge, go for hard. That could pretty much work for almost any game.

How would you accomplish this in a platformer? Not Cuphead mind you - like a .... Mario 64?

More health and/or less damage from enemies or from falling, more checkpoints, longer jump distance...