There are two types of apps: 1. the ones that professionals use and 2. the ones that consumers use.
for 1. they don't care if it looks native, as long as it works and is performant e.g. DAWs, Video Editing tools, Trading, etc.
2. likewise I don't think it matters that much.
my guess is the myth came from OS makers.
I don’t care if things look native, however I am actively repulsed by modern web design trends.