Current sieging logic is definitely not realistic and not even equal for everyone. If you didn't make your siege base 1 year ago, it's impossible to siege Vestfold (if the coalition will not allow you to use the current one). There should be more opportunities for relatively newer players and more strategy factor.
Like newbie camps, even if you are in a town, you should be able to create a 2x2 chunk military base that lasts one or two weeks, and with fewer restrictions; like they can be nearer than 8 blocks distance to forts, maybe 3 chunks like before. They may include inn plots for allies to respawn. And not reclaimable after it falls. Maybe even with high upkeep as the cost of siege.
This implement would make all current impossible-to-siege forts siegeable, and fairer for everyone. Who wouldn't want to siege Vestfold or even Nes