Eh, I’ve previously fucked up my bootloader, all you need to do to fix it is boot up a live image, mount your root partition, arch-chroot into it, then follow normal steps to set the bootloader back up - it’s not scary if you know what you’re doing, just time-consuming
Not if you don’t use windows, or if you want a more modern looking and less busy interface, or integration with what I consider the best git GUI. I used to use N++ long ago, but after trying ST I realized it just feels clunky.