Yeah, it all adds up. I think a fair amount of effort has gone into maintaining old macOS versions, all of which is time away from everything else.

Having clear policies helps both our users and us. We have:

In general, we aim to support all current versions of Linux, macOS, and Windows.

Which means macOS 12, 13 and 14, not 10.10, 10.11, 10.12, 10.13, 10.14, 10.15 or 11 - 10.10 is very much no longer receiving security updates.

For the time-being, I don't mind keeping 10.10 along.