Investigation of unit retraining

[Atilius]

I've seen units lose experience between the end of the battle and the return to the campaign map, but this seems rare. I can't be certain, but it seems plausible that this is a result of healing.

Still, I don't think it's wise to avoid healing enhancing ancillaries. While the average experience of the unit is lower, you haven't lost anything, and you have men you wouldn't have otherwise. To bring the unit back up to full strength, you end up paying more for the higher experience level than you would if you had more healing. Given the fact that it's unusual for healing to have any effect on overall experience, don't see that it's worth passing up healing when you can get it.