first and foremost, welcome to the MacOS family and this is a well written review / impression from a first time user.

i guess some of your concerns are validated, i feel you and i trust that it is just a transition thing, it should get better for you over time (experience).

for the Bluetooth pairing troubles that you are going through, i believe this is quite common for Bluetooth devices to only connect one device while paired, and requires unpairing if that particular device does not have multi-pairing support?

for instance, i have a Logitech MX Master 3 and i am able to pair 3 devices without needing to pair and unpair - so i can switch devices without requiring to pair and unpair on MacOS. also, for the scrolling, i totally agree with you. even with the 'smooth scrolling feature' enabled on my mouse's setting, it is slightly smoother but still not as smooth as the trackpad's scrolling.

MacOS is a closed walled garden hence there's alot of verification and 'unlocking' to do in order to run certain apps / softwares. this is one of the reason why Mac devices are one of the safest in the market and for power users like yourself, might be a little tricky to navigate around.

but one thing for sure, Mac devices are amazing especially if you have an Apple ecosystem built around you - the integration is amazing. this is the one thing Windows cannot provide - the ecosystem. i am referring to the usage of an iPhone, iPad, Watch, HomePod and Apple TV 4K - it just works.