I read some criticism around Bitcoin, because is too volatile, but this is the reason for the success of this crypto ( and others), imo

Also, why do you need a stable coin ? If you can't pay with Bitcoin for you coffe, who cares ? I mean, it is just like gold, you don't walk around paying with gold, but you know it has value.

I just can't see a clear disadvantage on being too volatile, something that could make ppl loose interest on Bitcoin. I would like to hear opinions on that.