It was worse over here due to patchy distribution of American comics. So, during the Bronze Age, suddenly we missed parts of classic multi-issue storylines;
In X-Men, The Shi’ar / Imperial Guard / M’ Kraan Crystal (107), Alpha Flight (121), Phoenix Saga (137).
The Avengers / Defenders War
Captain Marvel 33 - end of Avengers / Thanos story.
as examples.
Also, I found Avengers Annual 7, read it, discovered it was a two-parter with Marvel Two-In-One Annual 2, couldn’t find that for a couple of years and was gouged when I did.
Wanting to just read the stories now, and recalling my doubtless OCD-amped frustration and desperation over missing parts of key stories back then, I’m much more content with having comfortable, easy access to collected physical or digital editions rather than being enslaved to the back issue market.
Options evolve, and you evolve, not always in constant alignment.