Yeah, I think CCP could definitely add more interest to the current approach, not only for security status, but also for standings. Consequences for choices are good, so there’s plenty of opportunity to add more nuance to the current system.
For example, why anyone with low sec status can dock in CONCORD stations is weird and it’d be logical for that to be extended to stations owned by the major Empire corporations (eg.the big 8 mega corps of Caldari, Fed Navy, etc.) so that docking rights for low sec status were removed in highsec.
I think Lore wise, there’d also be some Corps that wouldn’t remove docking rights, either because the Corp itself is known for criminal activity, or because they really don’t care for the Empires. Thukker Tribe as one example.
That should also be extended to standings. If you have poor standings with a Corp or faction, they should also lock you out.
However, I don’t think CCP should ever determine who players are allowed to include on their access lists for Upwell structures.
Unfortunately, if CCP did implement a change, I fear “simple” is a correct word. I don’t believe they are currently capable of developing well thought out mechanics.