Yeah, the decision to roll back on damage decks was pants-on-head stupid, but FFG has a history of going for the hard-on-player decision first (the Scum dial fiasco) and changing it to be the most accommodating to everyone.
I still think the ideal way to handle it would be to have players assign damage decks to their opponent, to represent their ships choosing a target priority ("Target their secondary weapons!"). It'd be more thematic than simply choosing the deck that is least painful to them. However, I also appreciate the counter-argument from people who don't want to have to share their decks with opponents who may not have the best hygiene.
The Scum dial fiasco all caused by someone who said something they shouldn't have far too early and violating things that were clearly permissible by the rules. Stupid was just putting the alternative paint dials in the box to begin with.
It would be great fun if you could bring the DD that your opponent is supposed to use but as you point out you run into plenty of people who hate, and sometimes with GREAT justification, people using their stuff.
Ffg should at least make regional and national events require the new deck as well but allow store championships to determine if both are allowed. You are much more likely to have a casual player who doesn't have the new deck at a store championship and extremely unlikely to have any at a world, national or even regional event. This would solve most of the issues.
This is certainly true and I also believe that any official tournament should be allowed to REQUIRE the new DD provided they can provide copies to anyone who doesn't have one. I thought I saw somewhere where a tournament did require the new deck and actually handed out copies as needed.
Unlike everything else I believe the DD is one thing a person should have no trouble switching because who really builds a squadron ONLY based on what is in the DD? If your criteria for squadron selection is based on the probability of a specific card out of the DD showing up at a specific time and ruining your game, or not, I'm sorry to say but I think you are putting too much time into the game.
Someone mentioned it upthread but the percentage of people who will play seriously play tournament but who will not purchase the second core set is pretty small. I mean people dish out plenty just to pick up expansions for a single card in them to use in a squadron so asking them to get the new DD shouldn't be a stretch. Seeing someone play Poe or something else specific from the FA Core and not using the new DD is horrible because you know they have it.
Now one thing I believe the old DD has going for it is that there are probably a LOT more "extra" copies of it floating around out there; you saw a lot of people buying two-three core sets for the additional dice but also to get the TIE Fighters needed to fly a full swarm but with the FA core you're not going to see as many people buying two copies much less three or four because those extras just aren't as needed. If a survey was taken among people who own more than one damage deck I believe the Original Core/FA Core would be a lot higher than 1 and probably over 2; I own 2 original DD but 1 FA DD which I believe is pretty common but the number of people who could balance that out is pretty low.