I use AdGuard Home, in a Linode instance, and point my pfsense box to it.

It depends on your provider, out the backwoods of Missouri. They do not have uninterruptible power on the noes feeding the homes, so when the power goes out the node which would transfer your traffic to the Internet, goes out as well, making a UPS pointless. That being said when I was in California in the backwoods of California, everything had either a UPS or a generator back up so as long as you had a UPS on your modem and your network equipment you had Internet Unless the cable that carried the Internet was damaged.

Depends, but mostly ssh and vi, vim, or neovim depending on what was the default install.

College habits die hard, and I did 4 years of college work with vi/vim.