why is it possible gens are spawning so close together ?

3-genning is one of worst things in this game, very uninteractive and unengaging since the killer will never commit to a chase but just keep returning to their gens looking for free downs. Depending on the gen cluster, the perks and the killer character, this can go on indefinitely until the game server closes the session. Often survivors will simply let themselves get killed or disconnect instead. Just a ridiculous flaw in game design. And yet BHVR isn't doing anything about it, even though it's been a thing for 7 years (oh wait, they've buffed Deja Vu by 1%, now it shaves off a whooping ~5 seconds of repair time if you work a gen from 0 to 100% alone, that's totally gonna help break a 3-gen!).

And the solution seems so simple, I don't know why BHVR can't implement a rule in the procedural spawn algorithm that prevents 3 gens from being within a certain perimeter. If the current gen spawns don't allow for that, just introduce more possible spawns. I think it would be beneficial anyway to have much more random generator spawns such that survivors have to spend more time looking for them. Of course there are some maps that would need a more specific approach, such as Gideon, but that too should be simple enough.

Alternative solutions could be either to simply add an 8th generator, such that the killer would have to defend 4 gens when only 1 is left to do, or to give survivors the ability to move generators at a slow speed, an interaction during which nobody would be able to work on the gen being relocated. There should obviously be compensatory killer buffs alongside this, such as an increased base gen regression rate. I'm sure players would be happy to accept various general killer buffs if impossible 3-gens were to leave the game for it.