Future Proofing a Macbook

I've always bought the most advanced macbook I could afford. My thinking was that it would future proof me to be able to upgrade to the latest MacOS and use apps longer. What I have noticed though is that this is not guaranteed. I've noticed that I can run apps longer with better specs, but as far as MacOS upgrades, it seems that Apple negates an entire year at a time. Regardless what specs I have.

Do you think this will continue?

It seems I need to upgrade my maxed out Macbook Pro 2016 in order to use some of the new features, namely Shared iCloud Photos.

If I get an M2 or M2 Pro, Or M2 Max (or substitute M3 for these depending what happens next week) do you think Apple will allow, say the Max CPU, to get updates a year or two longer than the plain M2?