@MacSparky and @imyke were talking briefly about that in last week’s episode.
The transition away from Intel does not make it more easy to predict how everything is developing.
While you are guaranteed getting spare parts for 5 years, Apple does not make any statements about how long you are able to run the latest OS on the device as far as I am aware. In the past, you were fine for 5 years or even longer, but apparently lately it does not work out in a similar way. You have a point there. It will be interesting to see how this develops. There even might be legal issues lingering in Europe regarding this (or not, I am no lawyer): of course, it is fine not to ship your latest OS for a device sold several years ago, but we are entering a dodgy area when Apple stops shipping security updates for a device within 5 years after its sale. Then again: they do not stop shipping security updates for older OS versions, but they say “not all known security issues are addressed in previous versions (for example, macOS 12)” (About software updates for Apple devices - Apple Support). Which is both understandable and interesting.