50
When the homie asks why you'd rather play Pathfinder than 5e
(lemmygrad.ml)
No, I don't care that 'it's more book keeping'; when 5e has kineticists, then we can talk.
That's not what bounded accuracy is. Bounded accuracy is only the rule (guideline, really) that you'll never add more than a fixed value (+20, I think) to a d20 roll. It is not about damage, HP, or how many d20s you roll.
HP and damage are free to scale, but the d20 modifiers are not.
https://www.dandwiki.com/wiki/Understanding_Bounded_Accuracy_(5e_Guideline) is a good summary. The developer's own words section is also detailed.
Ok, yeah, I guess its not the point, but as your article notes among all the things it isn't intended to do, it has the same effect. It's still what limits the effects of choices, rather than the number of them.
It limits some choices. It limits things that give you a bonus to your d20 roll. There's nothing about it that prevents other vertical growth or any horizontal growth.
You could give players a special feat every level, for example, chosen from stuff that's like "Roll deception vs their passive wisdom. If you succeed, their dexterity becomes the lower of 8 and the current value, and they are vulnerable to sneak attack."
Nothing about bounded accuracy prevents that. The fact that you don't get to pick stuff like that very often is the limiting factor on making powerful, differentiated, characters.