You can even wipe the entire SSD on a mac and STILL you have the ability to reinstall macOS without putting in any disc or USB stick. It's just always there waiting
This is almost correct. For the new Apple silicon machines you do need a second working Apple computer and cable in order to do a DFU if you completely wipe the SSD.
You can also waltz into an Apple store to have it done if you don’t have access to any other machines.
You can also waltz into an Apple store to have it done if you don’t have access to any other machines.