I'm happy with the idea of a pairing exercise. I've felt regretful about every time I've gotten involved with a take-home even when my submission was successful, so maybe that's why I'm reacting badly to it here. You mention scoping, but there really has to be a way to enforce that other candidates don't spend more time on it than you do. Otherwise it is a resource consumption contest.

I agree - I have regretted every time that I agreed to a take home assignment, including when it’s been successful. The reason this worked was the HM simply sent me the assignment and asked me to take a look (and clarified that there’d be no hard feelings if I decided not to move forward). I took a look, and it turned out they weren’t lying about it being well scoped!

I always appreciate when they resemble the work the company expects I'll end up doing, because I do actually enjoy the work I do.

If I don't like the take-home, I assume I'll probably hate the job too. Whereas traditional interviews tell me almost nothing about what I'm going to end up doing day to day.