With the exception of the github profile, that's not my experience at all -- if anything, lots of hiring managers want to ape that sort of experience even if they can't really assess it because the alternative is something like this: https://www.smbc-comics.com/comic/a-job

Spending 2 years learning how to interview when you could have been spending 1.96 years getting passably good at something and 2 weeks on interviewing is madness, though.