I think in terms of hardware it’s worth it if you value the convenience. Stuff like the Apple Watch, Airpods, iPad, Apple TV, is good hardware and they work well together.
On the software side you can use cross platform software wherever possible to not rely as much on Apple’s services, in case you wanted to switch, then it would be too difficult
On KDE there’s System Monitor, which you can customize to show graphs for CPU usage and temp, among other things, and GPU usage and temp too.
For in-game monitoring there’s Mangohud, also very customizable on what you can show in the overlay