> The issue that most people bring up is that it optimises for people with free time who can work on these things out of hours.

yeah, I'm currently trying to improve my ADS skills that have atrophied since I graduated, but it is just so incredibly much harder as an adult with responsibilities, work and hobbies than it was back when I had a bunch of time to go deep into all different programming subjects. By the rate I am going now, it's going to take multiple years to get to where I want to, without sacrificing more than I can of relationships, sleep, health, or other responsibilities

No one’s time is free though. Whiteboard coding was imo more fair, less biased, and signal rich. AI does change the equation a bit now.