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Maybe something has changed. After all, getting a super artifact with +2 speed (or, for example, chainmail +8) for some weak hero is quite a good deal.
The main problem is that you need to find a hero with these skills. And then level them up, although finding such a hero is more difficult. If it does happen, it's usually around weeks 4-5, when the party enters a prolonged phase and there are opportunities in the pace for such activities.
But if a suitable hero is found, it makes sense to protect them and level them up gradually, including for viewing purposes.
Governor is only recruited for fun - it's difficult to level him up in the first and second weeks, and then he's no longer needed.
Terraformer was mostly recruited by chance - if in the late game I had to take ballistics for a castle assault or was offered it along with some other weak hero. That is, in the early game, ballistics are not very useful, and in the late game, Terraformer is not very useful either.
Leprechaun was given to weak heroes several times, and I didn't refuse.
I don't think I ever recruited a Merchant.
Sometimes I recruited a Marauder - mainly for Castle on a poor starting setup, I took him for the starting hero-attacker to gather more money in the first week. And in the second week, I already leveled up another hero.