Speaking personally, I don't think they're dumbed down. They're pretty straightforward to use, sure, but they do what I need them to.
In terms of the hardware; I have a 2011 MacBook Pro at home that's still just about as solid as the day I bought it. The battery's dead, but that's to be expected for its age. I'm typing this on a 2014 Mac mini that's running the latest macOS perfectly through OCLP. My main computer is a 15" M2 MacBook Air that is a genuinely impressive machine. If anything, Apple have kinda shot themselves in the foot, making devices that last far longer than their software support allows.