Earlier quoted context omitted.
The average Mac is in use for far longer than your average upgradeable windows laptop from Walmart/Costco. One strong evidence for this is that macOS market share is actually 20% on desktop/laptops despite Macs selling only about ~8-10% of total PCs worldwide. [0] So yes, on average, Macs are significantly better for the environment. Having less RAM does not mean people replace their Macs more often than Windows comp…
My wife’s computer was getting slow so I stuck another 16GB of RAM in it for like $30. that upgraded added years to its life. I have a stack of old MacBooks I can’t use because they only have 256GB SSDs that can’t be upgraded and I was constantly running out of space on them. There is something to be said for being able to upgrade a machine to lengthen its usable life.
For real? With prevalent cloud storage and cheap tiny external devices it's hard to believe they're totally useless.