There have been 3-6 posts on this subject. But it's a good idea and I don't think there has ever been an official word on the subject.
As someone who plays Altair I find it annoying that my standard units have "potential" +25% exp. A trait made useless by how quickly and often units become underpowered by unit size techs. I become attached to units that do well and its annoying to disband them for such a silly reason.
Also too often do I have reasons not to build troops. Leather tech soon? Have to be stupid to build new troops now. Logistics? Ditto.