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>> I used to feel the need to upgrade my Macbook every 2 years or so

You're a minority. The vast majority of Mac owners don't have thousands of dollars to spend upgrading every couple of years. And they don't need to - that's one of the great things about Mac's! I'm an iOS developer + do a lot of heavy music production on my Macbook Pro and after 4 years it's still working well. I'm starting to consider an update (mainly because of the vast improvements the Apple silicon chips bring) but I could probably use this reasonably for another year or two at least. More 'normal' users I know (docs + web browsing people) typically keep their Mac's 6+ years and those are the 'cheap' lower powered Mac's.