That's not really the most charitable reading of GP's comment. I think they very clearly mean
that Apple does not sell Macs with non-HiDPI displays anymore. It's not a configuration they sell, so they don't need to support those features anymore in their current offerings.
You're right that there's nothing stopping someone from hooking up an HDMI-to-VGA adapter for their 22" Trinitron from 2001, but that doesn't mean boat anchors are a meaningful market segment. It's not a consideration for why they should retain a font rendering feature for a modern OS. You're just going to have to suffer with fuzzy fonts for your retrogaming hobby.