Gen rushing needs a penalty
Before survivor mains attack me for this just know I play both survivor and killer about equally. In both roles I hate how easy it is to do gens. I think the time to complete a gen should be increased big time and there should be a decent penalty for 2+ people on a gen.
As killer, gen rushing can't be stopped by ruin most of the time. Also, by the time I get my first hook I always end up with 2 gens already completed. Only way to truly stop a powerhouse team (especially an effective SWF team which seems to be most of DBD anymore) is by playing Billy or Nurse. As survivor, I feel like I gain little from the match from gens being rushed. It gets harder to pip when your team is full of gen jockeys. The match itself grows less fun because the killer becomes a complete joke in many cases. I also feel like it's not challenging enough as survivor, which personally gets boring.
Besides just changing numbers to solve gen rushing, they can also implement something in which the entity gets involved if survivors are too effective. It'd be cool if the entity denies access to gens for a short period of time if gens are going off too quickly. This would make sense too since the entity is there to help the killer anyways. Putting this into the game also wouldn't be an issue since it basically already exists in a few perks.