This is what I'm afraid of tbh.
Not only will we now see the same units being spammed from every codex (long fangs, chimera vets, etc.), but now if there aren't too many restrictions, the same list brought by everyone, with the choice units from each codex.
We might have to get used to everyone fielding forces led by Mephiston, backed up with long fangs, dakka dreads, vendettas TH/SS termies, IG vets purifiers etc. etc.
I've no problem with power gaming, but it might just become just a bit too mundane now instead of moving into the variety that I had hoped it would be. Less spamming, more balance.
EDIT: Damn browser making me double-post, sorry...