Right...
I didn't play WoM, but i too did play an alarming amount of other 4X games. The main thing to keep you busy in the beginning of practically all of them was to send out scouts to explore the surroundings and/or levy starter armies to make use of the things you found, while your city/base slowly build up and the first techs/spells where researched. (MoM, AoW, Civ, ect...) This way, right from the start, in every turn something had to be/could be done. And in all of them, pioneers/settlers or other means to get more citys where expensive in one way or the other. Made them meaningfull.
In FE right now, you only have your Sovereign and that one starting hero. I kinda like that. Problem is, there is not much to do, as long as the only other affordable unittype in the near future to do something with would be the pioneer. (As long as the first hero isn't a merchant.
) ...Yeah, just raising the pioneercost or change to an expensive pioneerkit would slow down the beginning pace even more. So why not make early troops more affordable? Would solve multiple problems at one.
The thing is, like always, everything is connected. The more complex a system/game, the more stuff will be influenced by changing one factor. I think the devs know their jobs, and so, it probably was a clear desingdesicion to stray from the conventional path in this matter. I can't see a possible reason or goal yet, other than to make the game more unique tho. Does someone have an idea on that matter?
If not, this may be just poking in the dark.
EDIT: The Outpostthingy coul be easly resolved by chanceling the need to sacrifice a pioneer for it. Just make it cost some gold instead, for example.