Bluetooth support is still a shit show if you don't buy a laptop that has been in some way developed for linux (if not for your current model, then for a model using similar components). Alternatively, buying a custom bluetooth usb adapter may work but only on a supported distro and only ever with an older bluetooth protocol.
Same goes for WiFi. Good luck trying to get WiFi6 to work properly, ignoring the fact that you have to go out of your way to find an adapter that will even work in linux.
I have a Lenovo laptop where Bluetooth works perfect. I even had a Bluetooth mouse by Logitech that could switch between BT and the logi reciever, so I was able to use it on two computers back and forth with a button press. It instant connected to laptop, took ~1 second to connect to the proprietary receiver.
Maybe a fluke, because the keyboard died on that laptop. Just like every other Lenovo I've owned.
Never buying another one even if it has the exact specs I need when I am shopping for a great price, which is how they've gotten me 3 times now.
Same goes for WiFi. Good luck trying to get WiFi6 to work properly, ignoring the fact that you have to go out of your way to find an adapter that will even work in linux.