Let's be fair; the thread had derailed a few times, and it's easy to mistake something relevant for another derailment. I agree with Nashoba though; whether or not the mech or frame will have a pilot will dictate how the rest of it will go. It has benefits, but also drawbacks in that it may negatively impact roleplay. On the other hand, if pulled off well, it could actually add to roleplay like it did in Eclipse Phase. The choice of whether or not the SAoY will use pilots or ST them into the hemosynth itself is up to Wes, as is even the decision of whether or not the SAoY will have frames. I feel that if it's there, players can RP it and GMs can use it, but if it isn't, then they simply can't. And even if it's there and not liked, and therefore not used, nothing is lost either. Assuming it's just an article.
In regards to doorways, I feel that really isn't the role of Frames and Mechs at all. During urban warfare, the PA would be the ones storming buildings, while tanks and frames would be in the streets; they'd keep those clear, and demolish the building if resistance is too much. Not go inside.