Its been said before, here it is again! We need some postern doors on the keeps! Will make a much more enjoyable dynamic with keeps then the zerg smash at the front door and if you weren't there when the siege started, good luck running past every attackers FoV to get in gate.
Here is some literature showing postern doors were a valuable part of a castle, as well as designs for multiple castles:
https://www.smithsonianmag.com/travel/castle-architecture-22746178/
Exhibit A:
https://www.google.com/imgres?imgurl=https%3A%2F%2Fi.pinimg.com%2Foriginals%2F2a%2Fe3%2F01%2F2ae301a76bfe245036d442ef610f4677.gif&imgrefurl=https%3A%2F%2Fwww.pinterest.com%2Fpin%2F536421005596969152%2F&docid=rLH8NXQgFO4xSM&tbnid=QvRW1dk0Mof-kM%3A&vet=1&w=1600&h=1400&source=sh%2Fx%2Fim
Exhibit B:
https://images.app.goo.gl/dZHCrcgxMn7pemE39
Exhibit C:
https://images.app.goo.gl/uEtkt5VNFYikrPeo7
Here is some literature showing postern doors were a valuable part of a castle, as well as designs for multiple castles:
https://www.smithsonianmag.com/travel/castle-architecture-22746178/
Exhibit A:
https://www.google.com/imgres?imgurl=https%3A%2F%2Fi.pinimg.com%2Foriginals%2F2a%2Fe3%2F01%2F2ae301a76bfe245036d442ef610f4677.gif&imgrefurl=https%3A%2F%2Fwww.pinterest.com%2Fpin%2F536421005596969152%2F&docid=rLH8NXQgFO4xSM&tbnid=QvRW1dk0Mof-kM%3A&vet=1&w=1600&h=1400&source=sh%2Fx%2Fim
Exhibit B:
https://images.app.goo.gl/dZHCrcgxMn7pemE39
Exhibit C:
https://images.app.goo.gl/uEtkt5VNFYikrPeo7