As one of those DM-s who dislikes multi page background, i can share my 2c on that topic.
First and foremost, i hate lore dump expositions both as a player and as a DM.
Now, when i'm running 5e, 95% of the time, characters start at lv 1-3 and campaign ends by lv 8-10. Characters at those starting levels aren't adventurers yet, or at best, they had only dipped they little toe into adventuring. They didn't do anything so important to warrant multi page background. Usually, they are also young, so not much life experience in general. I look at their backstory same as i look at CV for junior positions. Clear, concise and short. Give me highlights.
Now, for more established starting characters ( mid tier 2 or above), i put more emphasis on party backstory. What did they as collective do up to that point. It's team game. Story isn't about Tom,Dick and Jane individually. It's about Tom,Dick and Jane together as a group. I highly value good group cohesion and shared interests and goals that align with campaign theme and setting. That's why we have rule that no one creates characters before session 0.
Now, i get that some people like to write and flesh out details. But question for you, for low level characters, what would multi page background even contain?