is the 2020 SMB Game & Watch valid for Super Mario Bros. speedruns? if not, why?

there have been many answers to this question and the answer is no because you can enable infinite lives

mainly because its slightly faster too

i didnt know thanks, but could there be a category extension for Game&Watch, or is just too unused for it?

i did ask about that once, but I'd say it's barely a difference but wouldn't be allowed. so yes.