The downsides:
If you find the Tear of Ashi before completing the main quests, scouts will still appear, but there will be nothing left for them to steal. The camera showed succubi, but when Vares fled from the demon towards the Elven faction (in the opposite direction from where the succubi were going), he defeated the Hellhounds, and the "capture a scout" quest was completed.
I was lucky that I found the Traveler's Boots in the artifact shop; without them, the hero without logistics simply wouldn't have time to escape from the demon, and both heroes need to reach their destination to complete the quest.
The battle with the gnome wasn't difficult for me (I lost a couple of hundred infantry): firstly, I had been playing for a long time (I had a lot of troops), but the main thing is Dark and Light magic. I can hardly imagine how to win this battle without these schools of magic (unless you use Chaos and destroy your own catapult). So, as I see it, there are three mandatory characteristics (not much freedom).
Is it just me, or are the gems ordinary, not like in the screenshot?