Further rent control is a viable solution to the problem of existing residents being displaced. It isn’t a solution to the difficulty of moving to desirable areas, but rent control advocates don’t consider that a legitimate problem. Or at least are okay with dampening the upward mobility of already affluent creative-class types to protect marginalized communities.

Notice how the possibility that actually non-affluent people would move somewhere for a better job is not something they think about.

Nope, that's because rent control makes that problem worse, so it's best to ignore it.

Hahah. Well, if rent control's high level of support raises your blood pressure, wait till I tell you about San Francisco's popular BMR lottery... ;)

A low-income applicant has a nonzero chance in a BMR lottery, which is better than their 0% chance in a market-rate building. There is a logic to it. Unfortunately the thinking usually stops there, rather than considering how to raise the chances overall.