The KoW crowd are extremely accepting of counts-as models, and allies are very often used so if you can find a unit profile to represent a model you might have, even if it comes from another army list and even if that unit profile is for something totally different, you can still use it with no complaints. For instance, my Necromancer on Mortis Engine will be used as Revenant King on an Undead Wyrm, because the stats mirror the model well enough. It flies, is decent in combat, is inspiring to nearby undead and provides magical support to them as well.
I think that acceptance of such things is more or less a taught skill. I mean, with KoW (Especially now), it is an assumption that players may be coming from other game systems with models already to play, they just need to pretend they are a certain stat line. The only reason I would suspect any player for
WHFB (Or now
AoS) would have ever not been ok with "Counts-as" models would be because the community supports that notion. Like in
40k, it's a fairly accepted rule that WYSIWYG is mandatory. But all the same if you're playing a converted army and want to play them "As" some other army, Say playing Chaos with normal style Marines, most people wouldn't have issues, as long as things are clear.
All I'm saying is that the whole Counts-as issue is more of a constructed issue of the games and people who play them, rather than a serious flaw of the game. Except for back when GW still had physical locations everywhere and supported the "No conversions" policies. Although I guess that might still be an issue for people living in Europe, it's just not really a thing anymore here in the U.S.
Hey, on the topic of other games to play, has anyone heard of or played Wrath of Kings? It's a new-ish skirmish game by CMON (Cool Mini Or Not), which is obviously not a Warhammer replacement, but it does seem fairly interesting. It's also a game that is a full rules for free basis, so anyone could attempt to proxy it before ever buying the models. The models themselves are of quite high quality, as long as you like the aesthetics they have put into the game. I'm currently attempting to paint up two small armies, so I can try to convince friends/anyone up at the FLGS to give it a whirl.