What issue do you have with the side quests?
What issues do you NOT have with it compared to other designs? Being ambiguous as to lore it's fine as other games can and have done it and it works well in here for the community to discover and discuss the story and Lore together.
But the side quests you shouldn't have to worry that missing an encounter of an npc locks you out of the next one and that npcs quest line with no information whatsoever to make an informed decision without having to look it up online from people who have tried and failed before.
In this game we have npcs die when you enter a new area with no indication as to why. If you didn't do y before that which makes another npc appear then congratulations both of those npc questions are locked for you. Heck a whole fucking ending is locked for you in this run without even being given the option to decide.
Didn't open every single path way in an area? Didn't meet a completely different npc that you don't even know up until that point? Didn't go to a random background item that you ignored multiple times before? Did you turn on a bonfire because logically you would want to be able to warp back there when you want to go to that area later, but forgot to meet the npc at a different area that for some reason you u absolutely have to meet there before being going to the new area?
Congratulations, you just broke another 1 or 2 quest lines, maybe even got another npc killed. Good luck finding a body to regain shit.
So much shit is tied together with no indication. You can miss out on items, trophies, and even armor/weapons. It's not even vague, you absolutely need to have this information present to be able to do it all.