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No... you're wrong about Vitya.
1) What didn't you like about Haven's stats for a ballista? 30% of stats go into attack, 15% into knowledge, totaling 45%. Only Inferno has more.
2) Machinists start very quickly because the ballista effectively eliminates low-level neutral creatures, so there are usually no problems with clearing mines.
3) Minimal losses thanks to the tent.
So, on small maps, machinists have a decent advantage.