From:
https://www.apple.com/macos/macos-ventura-preview/
Does anyone else feel like these support cutoffs are getting a bit stingy... Cutoffs from 2017, 2018, and 2019 Macs (ok the last one was because the last mac pro before it was so old). 5 years might be considered good for a phone, but Windows 10 will easily run on 10 year old laptops and will get support for years to come (yes 11 is different but 10 will be supported through 2025, an absurd life for some machines), I don't think I'd be happy with a 2017 Macbook Air losing support in just 5 years, or far more expensive machines in 6.
Seems obvious it's to rush along the end of Intel macs, but it could well feel like shafting, in 2017 the switch was just early rumors and most people don't keep up with this stuff, or just weren't able to wait so long.
Ironically the best way to stay supported on those systems might be switching to Windows full time on them, though I'm aware third party macOS patching tools exist to get some more years of support, but the very fact that some of those are very easy jobs (i.e patching one kext on one wifi driver) just says even more that the moving support lines are on flimsy technical barriers, and some of them seemed to have none, even if they didn't want to officially support an out of support wifi driver which is reasonable ish. We're past moving all drivers to 64 bit, Metal compatible GPUs, and it's not T2 because the 12" Macbook somehow sticks in there, it just seems to be ending models as they can get away with maybe based on a blend of popularity and other things, because there seems to be no hard technical line here.