They are not being sold by Apple.
They
were until this March.
Reminds me of my Mac Pro 1,1 got a few macOS versions then Apple dropped it.
Mac Pro 1,1: Launched 2006. Discontinued 2008. Not compatible with Mountain Lion, 2012 but the last compatible OS,
MacOS Lion launched in 2011 was supported until mid 2014 - about
6 years of support after model's discontinuation.
2017 iMac: Discontinued 2019. Not compatible with Sequoia but last compatible OS Sonoma (2023) is the current version - on past performance - probably receive support until MacOS 2026.
6-7 years of support after model's discontinuation.
2019 MacBook Air: Discontinued early 2020. Not compatible with Sequoia but last compatible OS is Sonoma (2023) so, again, supported until 2026,
6 years after model's discontinuation.
2014 Mac Mini: Discontinued 2018. Last compatible Mac OS: Monterey - still receiving updates
6 years after model's discontinuation.
Probably the worst case: 2013 Mac Pro: Discontinued late 2019 (but Osborned with extreme prejudice in 2017). Last compatible Mac OS: Monterey which is still receiving updates in mid 2024 - so even a machine that was obsolete years before it was dropped has still seen the thick end of
5 years (and counting) of support after it was discontinued.
Looks like there's a pattern here. Machines get dropped by the next MacOS when the usual 2-3 years of updates to the
current OS will see them well into "Vintage" status (Products are considered vintage when
Apple stopped distributing them for sale more than 5 and less than 7 years ago:
direct quote from Apple)
...so, given that the M1 Air was still being distributed by Apple until a few months ago - and the
rumours suggest that
none of the M2/M3 Macs should be starting any long books right now - I don't see much worry about picking up a M1 now if the price reflects the age of the product.
If it's really important to you to always be running the absolute latest version of MacOS then it's probably equally important to have the latest generation Apple Silicon chip, so why would you even be thinking about a M1?
All that said - 6-7 years of critical updates before you have to rely on an enthusiast-supported firmware replacement ain't great compared to the PC world - but it's the best you can get with Apple. However, endless legacy support is also largely why Windows is like... well, Windows and even MS is getting a little bit more axe-happy with old hardware now. I suppose there's always
Asahi Linux...