I always have two artillery units with me just because it's a fun unit to use. I could win most battles with an 18 slot army, so I don't feel like I'm giving anything up.
WRT the slower movement speed on the strategy map... it gives me the flexibility to take a smaller town or fort on the same turn, instead of waiting to build seiege equipment. So it balances out. Mainly I just like blowing up stuff.
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