I feel the reason that Windows computers indeed slow down so much over time is because of the huge availability of software which is available for them. People just don't seem to be able to help themselves when it comes to downloading something new and installing it and trying it out to see how it works
Lol, absolutely agree - and not to mention the add-on consequences of adware, malware etc.
And OP: I don't see anything wrong with Macs; yes one has to pay a premium but they look gorgeous; aesthetics does also matter to me. There is a lot of rubbish in the Windows market, esp. of laptops.
Feel the quality: