I think the entire point is so that many with devices that will never see updates can still continue to use those devices.

what stops folks from continuing to use them as-is, aside from this threat to break TLS 1.2 for them?

if a service runs TLS 1.2, and a client runs TLS 1.2, and they can talk to each other right now, why change the language?

if you released a thing, and people are choosing not to use it, is the right move really to enshittify their current choice to force them off it?