I think sapping was overpowered in RTW. I only use siege equipment up to the point where I can build artillery.
Once I have breached the wall the second thing I try to do, after sending my infantry inside and up the walls to conquer the walls, is sending up my crossbowmen onto the walls. Once I have them there the town is lost because I can take all the time I want to prepare my last push to the center square or inner walls, and any sallying by the defender is drowned in my crossbow bolts. That is a good substitute for capturing the towers that basically only fire 1 bolt every 2 seconds.
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