[ashdev]

That's true, but if you compare the resale value of PCs and MacBooks, you'll find that MacBooks(even with outdated OS) have higher resale value. Therefore, this is a bit of a tricky situtation for PCs since they can't be sold for much.

[dvfjsdhgfv]

It's a tricky issue. Supposed I want to buy an used MacBook now, for a good price and still running the newest macOS. I'll find lots of 4GB or 8GB MacBooks from 2015 for example that can't be upgraded. Or... I could move back to 2012 and upgrade RAM to 16 GB and insert 2TB SSDs. 4GB MacBooks are practically unusable for any non-trival task so that fact that you can run the newest OS and enjoy security updates means very little if you can't do any real work.