I agree, I feel they are meant to be a simple species for the player to learn the game's basics. Basically nothing is known about multiplayer. We don't even know whether it will be different species against each other in multiplayer, it could just be formica ereptor vs formica ereptor.
I'm hoping the player does get to choose their species in multiplayer, though.
Honestly I think it would be pretty cool if some species would have advantages over others in certain maps. I think it's pretty safe to say leaf cutter ants, for example, will be much stronger than Formica fusca. But if there would be a map that is bountiful with aphids that leaf cutter ants can't harvest, and very few leaves, the power of the leaf cutter ants could be balanced out with the fact that they have much less food than Formica fusca.
I'm hoping there will be some maps that favor certain species due to the environment, like leaf cutter ants should have a clear advantage over wood ants in a rainforest, and the opposite on the beach. I also think having some maps that are as close to perfectly balanced as possible are also a good idea to have. This will allow players to adapt in some situations, but also go head-to-head without having to worry about disadvantages in other situations.