In my opinon , N1 Siege system was very intuitive, and it felt instantly rewarding and i saw new people actually instantly understanding it and enjoying it, everything from that point onward was basically a downgrade, many changes were aimed to "nerf no-lifing" and none of it worked , while all of them added lots of complicated new rules which resulted in sieges being very easy to mess up by a single person (by taking reversal more than 14 minutes before the end of session and then making enemy able to take reversal again and essentially end up with 4x points than they would have if nobody interfered) , and very easy to simply play on unintended way, right now, maybe the most viable tactic is to completely ignore the siege for hour and a half as attacker and just try to storm it in last 7 minutes of a session to gain reversal bonus which is basically double of what you could have earned if you took the banner as soon as possible, while, as defender it is sometimes most viable to let attackers cap it , and then get the reversal, or simply cap it in the beggining and then cannon and gun spam endlessly and avoid melee (which a lot of people complaned about), actuallly fighting to hold ground is not even viable as in most cases capping the banner is detremental unless done in specific moment, i think those arguments are enough to justify saying that siege system is very far from working as intended, and advantage of simply no lifing to win them is FAR from being disabled.
Therefore, i suggest to simply use old N1 system, and maybe give 4x point bonus for first hour of the day , to give some advantage to people who cant spare more than 1 hour due to having no time to cap , and to make capping instantly rewarding and more fun for new players, also bring back plunder based on points gained that is instantly deposited to player balance, and you gonna have a system that is easy to understand, fun for everyone and doesnt require hours of time invested into it to make a difference, and is not abusable in any way and encourages fighting to hold the ground instead of trying to cheese out reversals, and discourages simply never leaving town walls to fight and resorting to ranged weapon spam.
Or alternatively, make a type of battle/skirmish/pitched battle that will work in this way and reward plunder only, if sieges are really hard set and not changable.
this way, you got alternative means to earn money and lower stake battles that may last shorter time.