I can personally vet that duo'ing veteran flashpoints is my preferred method of operation at this point. I tank, the wife just murders stuff, and depending on difficulty, I set my higher loyalty companion to heals, and her companion to dps or heals as needed. I have had to drill into her to read the tooltips on everything and to actually look at her stuff to understand what to do and how things work. Took a few play sessions, but she is much better than she use to be, and has gone from using maybe 2 abilities on her hot bar, to understanding when to use her cool downs and that she has AOE etc lol.
Not gonna lie, I forgot all about the self heal/meditate ability when I first got back. It wasn't until my first flashpoint run with everyone spec'd DPS and zero healing for me to remember I had an ability to click between fights, you basically never need it otherwise. Game is pleasantly, I'd say relaxing, levels of easy, with very little stress until you get into some of the group content, and that feels perfect for duo'ing. If the raids follow suit, you should be able to do them without full Ops group. I should find the wife and I a guild at some point, think we are on Starforge, just haven't seen anything that wasn't full RP guild or named something dumb as fuck. I've had at least a hundred rando guild invites from every variation of Jedi Cum Guzzlers (close enough) that one could imagine. Having played a bit on both Pub and Imp sides, at least during my play times, Imp side has felt less RP derpy, and less derpy in general.