Orcs – discussion about the race.

I won't quote, I'll just answer.
Against Orcs, Dungeon has been playing either pure summon or summon + chaos for a long time. So, building two ranged units is self-sabotage. And with one, you might fail (well, against Leto, darkness is understandable, and against Sinister, chaos is also the default. But with the rest, it's a mystery).

And about machines. With the appearance of "deadly cold" for all factions, machines, to put it mildly, have fallen to the bottom. Creeping is good, but three units that can disable them.... In general, it's difficult to rush with them, because it's quite obvious from the hero, and you can go for a counter-strategy even at the expense of development.