I think it does help but exactly how and to what extent I’ve no idea. Before buying all the 4Simmers 320 packs I saw only the Airbus house livery, or those horrible 330/380 wannabies. Now I see a variety, although of course it’s not reflective of reality. Still… every little helps! To improve real-world accuracy what I tend to do is temporarily uninstall packs for regions I’m not planning to fly in on any given day. This ensures I don’t get a fleet of LATAM or ANA 320s at Glasgow!
I still get a few of those awful 330s/380s, though!