They effectively wouldn't be ICs anymore if an important part of their job is to supervise

The chaos would be great for the bean counters. "Productivity" will be up for a month or two. Until it isn't.

That's literally what "senior engineer" is supposed to be doing according to what I hear are current industry norm, which makes as much sense as what your comment makes it sound. Basically a hidden management role, with all the responsibilities but none of the power.