Can one large size favicon serve all devices and browsers?

Question

All discussion about favicons recommend creating favicons of different sizes to target different clients. See this answer for example: Does a favicon have to be 32x32 or 16x

Answer 1

The question you referred is 3 years old and nowadays I'd (and I usually am) create one, high res favicon and assume browsers would (and from my experience it will) scale it down if needed.