You really don’t want to use stainless tools as they will plastically deform

They are made specifically for stainless fasteners.

You’ll frequently find them in the toolbags of aerospace professionals and industrial electricians and they are really the only folks that deal with a lot of stainless fasteners.

Bicycle and motorbike folks have lots of stainless hardware, too. And lots of time you’ll see folks blame JIS/Phillips on ruining their fasteners, but sometimes it’s just because they’re using toolsteel tools on stainless fasteners.