I rally don't think Apple don't care about the Mac. They invested huge amounts of money and R&D resources into it in recent years. The problem is it mostly backfired.

Those ultra-slim butterfly keyboards didn't invent themselves. Likewise the Touch Bar. Not developing it and sticking with Fn keys would have been a heck of a lot cheaper and easier. All the things 'everyone' complains about took a huge amount of attention and investment to deliver. Even the jet engine Mac Pro took a lot of work to screw up so badly. They just seem to have got it wrong.

Apple is constantly under pressure to innovate, from themselves as much as externally, so they just feel they can't sit still even when where they are is actually the best place to be.

On the other hand I got a 5K iMAC when it came out and ... oh... m... g... is that thing gorgeous to use. But a lot of the very pretty, very well engineered, innovative bits and bobs they've come out with recently have just been wrong.