Would that not just amplify the problem of the players' high tier armies with archers dominating the field? Those armies take very few losses so they could go on for several battles and never lose.
I played a thousand hours of warband in the beta, before any mods were made. Sure, might've been the community, but what made me want to play warband sure wasn't the mods. The mods were extra spice and variety to an already enjoyable game. Base game is way more important than mods will ever be.
I believe custom servers and a duel gamemode were also planned for release. Other than that, your statement is correct. No evidence of any plans beyond that.
I really do not understand why people expect that much from modders.
Feels that way because they only ever had one entry point. One ladder or siege tower, so only one part of the castle was used during actual sieges.