Why isn't 6 face buttons a standard?

[ktay95]

Wildcard36qs said:

ktay95 said:

Eh, 6 buttons is much better for fighters which btw you dont use your thumb for all 6 buttons but use 3 fingers like playing with an arcade stick.
Otherwise the real issue is that more controllers arent made like this

We use our thumbs for alot as is on a controller but dont use 4-6 fingers at all which are perfect for these extra paddles

I've always wondered, can those rear buttons be additional buttons? Or do they have to be mapped to existing ones?

Mapped to existing buttons sadly