Again, it's precisely a topic that I cover in my blogs about the first two ages of the X-Wing metagame.
Falcon could be immune to a single 3 red dice attack, but it couldn't repel multiple attacks and because it couldn't lock it's opponents out the super-defensive 3PO/R2 version of the Falcon wasn't actually that popular or successful and you saw Gunner/Luke far more often. So in theory it could but it was rarely seen and had obvious counters (bring cheap generic ships and shoot at it twice).
Palp-backed Soontir could be bulletproof to two or three attacks pretty easily, shutting out the 'just bring more generics' as a viable counter. The ability to repel a 3 dice attack wasn't new, but it was now being presented in a much more cost-effective, reliable and competitive form.
Between Wave 7 and Wave 8 the competitive game of X-Wing was completely destroyed and rebuilt from scratch, and it happened pretty much entirely because of two cards: TLT & Palp.






