there is so many strategy to win CS than crying. then why not enter the Castle throne at same time , always compress your players since the beginning and attack the castle as a big group. it will reduce unnecessary deaths and have a chance to immediate seal .Invading a Castle Seal means Domination so if you can't communicate well with your alliance , you'll just blame that the system is ugly?
the real purpose of castle siege is still there , Domination Check ,Switching check , sealing check ,defending check , invading Check , killing check.
all of this category are greatly increased in purposed , you have the every reason to seal the crown because you will gain the upperhand and advantage.
what the defenders did was perfect , they defended their castle dominantly because they have every reason to unlike before, a chance of losing in a last minute when you are dominating? where can you see a castle for real where defended by the army and lose because of the timelimit ?