I would say:
No to the trenches and walls/dragon teeth (those are basically forts combined with minefields) as well as the silos (they could just be combined with forts)
Yes to the canals, minefields and forts (they all do reasonably different things)
Overall though i maintain that in general (besides minefields) forts already cover most of these things.
No to the trenches and walls/dragon teeth (those are basically forts combined with minefields) as well as the silos (they could just be combined with forts)
Yes to the canals, minefields and forts (they all do reasonably different things)
Overall though i maintain that in general (besides minefields) forts already cover most of these things.