To be honest if I was an employer I probably would do leet code or similar. The logic would be that yes, many engineers are shy or nervous around people. But losing those is worth it since hiring someone bad that you have to fire (that wastes some months of productive time at the company) and then re-hire someone else is definitely worth that risk. Having made something impressive on github is somewhat fakeable since you can get a lot of help from the internet or even copy large chunks (that you may understand but didn't have to invent) from stack overflow. Someone who can do leet code at least have some hard-to-fake ability to reason and work under pressure.

That said, I still don't like doing leet code interviews and I'm pretty bad at them, but that's the logic that imagine goes on in an employers mind (hence why "they're missing out on some types of candidates" logic likely won't sway anyone reading these comments I suspect).