I think hosps are good for a certain kind of undead play, but not necessarily all. I personally like a high dspec undead, with forts + hosps, it's sturdy, can still run a high opa, is a ***** to take down. The alternative I see often, is pure glass cannon. Max out that OPA, rely on TGs, GS, Rax, and WT/CS. The hosps don't matter if you are never getting hit at home, and aren't getting ambushed. True an ambush against no hosps can kill 10% offense or whatever, but it's certainly possible to make that unrealistic during war. ANY type of attacker gets ruined caught armies home early in war, later in war undead and orcs have it rough, when avians/humans can certainly use elites as def a-ok.