Custom ROMs are like Linux. Only advanced users will use them. Regarding the functionality we lose when using a custom ROM, I think the trick is to use a devic

Custom ROMs are like Linux. Only advanced users will use them. Regarding the functionality we lose when using a custom ROM, I think the trick is to use a device from a "modding friendly" brand. Samsung, Sony or Huawei are not modding friendly. Get a OnePlus, Asus, Xiaomi/Poco/Redmi or Google Pixel and most if not all hardware will work fine. (My experience is based using the OnePlus 3, OnePlus 8 Pro and Redmi Note 9S with LineageOS and a Asus Zenfone 6 with OmniROM. Fingerprint works fine and even more exotic features like the IR blaster on the 9S or the flip camera on the Zenfone 6 works.) Now, by replacing the original OS you also remove some things that makes the phone better. Eg: the stock camera app, which often gives you better processing (there are modded GCam apps that might help fix this, alternatively you can save DNG/raw files). One useful feature that I had on the Zenfone 6 that custom ROMs can't give me is the ability to stop charging at a certain % (can be done with Magisk, but it's not supported by the ROM itself). The main problem for me are the apps. Many require Google services and Google's safetynet and both are a problem if you decide to use "pure" Android. Even if one decides to install Google Apps to have the Play Store and their other services, there's still the safetynet issue that gets triggered just for unlocking your device.