mass effect 2 is meaningless in the grand scheme of the things, but at least it kind of makes sense with how it was presented. you were basically on a black ops job that nobody was ever going to know about. and honestly complaining that the crew wasn't brought over wasn't a problem with the game it was a problem with lazy writers. there was literally nothing stopping them from bringing the crew back together, especially since...you know, they pretty much still showed up if they survived. the idea they couldn't make them playable because "what if everyone died!?" is really a stupid excuse because who honestly carried over a save where everyone fucking died without trying to do that shit? And even then, you could have just had been forced to only use the vermire survivor and liara if you were that dumb. You practically still have that if you let Garrus and Tali die anyways.