It's a different story if a secondary hero with these thieves is following the main hero and occasionally transfers them to the main hero. But that also takes a lot of effort. I wonder how often people use this tactic? And how often do they "ignore" these thieves?
I tried it once. It's annoying. It takes an extra minute for pointless things instead of fighting, tearing enemies apart with claws and teeth, and stabbing them with a sword. :)
Added 4 minutes later
You don't need to have many thieves; you need to have a strong army in the other six squares. And you can get it by joining other, weaker monsters than 50 dragons.
At the beginning of the game, while the secondary hero moves at the same speed as the main hero, I use it. Then, either I leave the level 1 warriors in the Castle and take the thieves, or I learn Scouting somewhere and, of course, I remove the thieves from the army.
I "ignore" the thieves if there is no diplomacy. If there is, then only if there is a Scouting spell.
But if these armies are weaker than 50 dragons + thieves in the seventh square, how can dragons even join? Or are the other six squares occupied by units of level 6 or 5 in the amount of 60-100?
Otherwise, in principle, it's correct. If there is a Scouting spell and, of course, something stronger than thieves, then why are the latter needed? And with an expert in diplomacy and a sufficiently strong army, thieves are not needed at all.
Sincerely, Draco
