Do you think the hatch and keys need changes?

I would at least like to see the green key have a use on its own since a green key without addons that you pull from a chest is a completely worthless item and that feels awful when you loot a chest only to get an item that has no use whatsoever. Some of the key addons for aura reading could also be revisited, Blood Amber is strong but some of the other ones are a bit lacking and could get a buff or rework. Maybe all keys could have some other minor function on their own without addons (such as some aura-reading ability that is just a part of the item and not tied to an addon).

I don't really think the hatch should be buffed in any way though, it is fine the way it is. It helps the last survivor in a trial have a better chance to escape in order to help bring the game to an end (otherwise they'd have no incentive not to stall and hide, not like they can really finish multiple generators on their own), and that's fine. I don't feel that the hatch needs to be anything more than that. Even just allowing it to appear once the generators are completed still counters endgame builds which, while rare, do exist and should not be completely denied by a single item.

(And regarding tome challenges that require hatch escapes, or worse, hatch escape with a key specifically, those should just not really exist imo. They heavily encourage throwing games and would be better off just being removed and replaced with a different challenge.)

TL;DR: Yes keys should be buffed, just not for hatch-related purposes.

Doing the remaining gens isnt impossible.

Its more tedious and risky than "hiding to wait for that other hiding survivor to die first and jump in the shortcut hatch" Especially if the second to last survivor instantly ragequits on the hook.

While useless items should be reworked, i dont think hatch needs to be made easier.

I think Keys should get their Aura Read-ability improved. The Hatch is fine as it is, it is enough if Keys have a very niche interaction with the Hatch.

But I think improving on the Aura Read-ability on Keys would make them more popular, even tho they will probably never be as popular as Medkits or Toolboxes (because those are more useful) or Flashlights (because those are more fun to use). But it would basically mean that Maps can be used to track everything in the environment while Keys can be used to track everything player-related.

I would also reduce the number of Bloodweb-Clutter for Keys (in general, for many Items). E.g. you dont need 3 Keys nowadays. You also dont need duplicates (e.g. the 24m Survivor Aura Read and the 48m Survivor Aura Read, nobody will be using the former).

The least-intrusive way I can think of hatch being added during a win-scenario for survivors (without needed communication) is:

Hatch also appears (closed) once both Exit Gates have been opened (not powered).

And Blood Warden also gains the effect:

• During this effect the Hatch is closed (if open), and blocked.

Just having hatch appear when gens are completed potentially removes a lot of gameplay regarding the Exit Gates as its providing an escape option prior to the "main path" escape option.

By further restricting it to both Exit Gates being opened, you introduce an additional requirement past the "main path" escape option, requiring additional effort, but potentially allowing a larger selection of positional options after an escape option has been given. Perhaps introducing situational gameplay during the end-game camp scenario, and/or giving survivors going for a challenge a "guaranteed" method of spawning hatch without need for communication to other players that they need to leave.