So, is it assumed as a bug more than a removed feature? If this is a bug and could be fixed I would treat this different to "no more support for older macOSes".
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How do you know? Maybe it's in the mentioned bug report 15774587; I tried to look at it, and was sure I could log into Radar at some point, but now I can't seem to dig up any valid login.
Are you sure? I'm pretty sure that I have in the past, and even that it used to be standard practice when discussing an ignored Radar report to ask other sufferers to go to the bug and do whatever the "me too" action for Radar is (I don't remember). Certainly there is a login at https://radar.apple.com, although that doesn't prove that it's meant for outsiders.