These are all good things!
I’d like to add one: as this is a new kind of interaction, many users (really a lot) don’t realize the comparison with the real applause and, relying on numbers, they don’t know what the number of claps chosen looks like.
I’d like to offer another reason, with the slider it becomes way way easier to give the “full” 50 claps, while on desktop it takes more “effort” to give the full 50 claps. that way you are differently valuing claps on mobile and desktop.
One of the issues I see with the claps still remains. It makes people think too much.
“Oh, how many claps should I give?”
“Oh, I didn’t know you could hold down to give more claps!”
“Oh, I keep forgetting to give more claps.”