I'd say you are right to a point, until you scale to CGs or Powerplay then the system falls apart because then you focus people into restricted areas and times.
... but not in the same instance/mode
As i said, the game is not designed around a single mode. It's designed from the starting hypothesis that players will join the game from whatever mode they are comfortable with
Getting back to the current CG - a Megaship with it's single large pad can induce some organic play in the form of Pad Management, landing queues etc.
Until someone decides to AFK on the pad.
At which point you can block them and relog.
Not a big deal.
And certainly a way better thing to do than to introduce a hangar loitering timer that will impact my game in solo in PG or even in Open in a remote part of the bubble which will rarely gets a visitor.