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Javdet, to catch 2 one-way passages with only one-way supporters, I had to start 13 games, which means such passages appear quite often; this is unfortunate. But there's nothing that can't be solved with 1-2 additional heroes (for the return trip) (there are 7 of them in the screenshot). This slows down the pace, but not as much as a group of snipers/a line of monks on a heterosexual, but single road. It's more problematic when the entrance portal is located somewhere off-road. I would suggest an additional rest point for this issue...
Or are there 2 one-way passages in the screenshot, both one-way? That's quite rare.
And what's wrong with the Grand Mage? It immediately provides 2 excellent spells. And that's not even counting Clairvoyance and Anti-Magic...