Anecdotally, though I’m sure many hiring managers would agree, junior engineers tend to be more coachable, raise fewer demands, and create less conflict.
The most dysfunctional teams I’ve worked with were heavily Senior. Though, the most functional teams I’ve worked with were 2-3 Senior devs. Maybe the future is primarily teams of a couple of midd/seniors, a single manager over 5 of these, and a lot of tokens. Paid what we pay juniors today, of course, as we race to the bottom.