Don't trust Secure Boot.
That's the second best thing as long as you don't worry about nation state actors (you're fucked by then anyway). Only requirement is a board/laptop manufacturer with a proper uefi setup (eg ability to set your own keys, not using those "do not use" test keys, etc) - that usually comes with business machines.
I liked how Dawntrail played out, but I feel there are a ton of stuff in there that met the cutting room floor. I think Krile was supposed to be present more, Solution Nine feels empty despite bring vast, and I thought we were finally getting a rideable train. But anyway, I understand the mixed reception, still, the game had to have its next Realm Reborn world-building steps after Endwalker concluded ARR, and they couldn't do much without being the slog A Realm Reborn was.