I don’t think it will cause boot errors if you don’t mess with important apps like grub.

I recommend the universal android debloater: https://github.com/Universal-Debloater-Alliance/universal-android-debloater-next-generation

It has good recommendations.

Keep the bootloader unlocked and adb enabled in case you mess up.

There are different levels to the approach. I went through each class of ermissions to see which app used them and stopped LOTS. I thought I was going to make my phone useless, but everything works just fine.

I would recommend not touching system apps unless you have a very good reason for doing so. And be willing to risk breaking your device.