Maybe the " limiting factor" is that they are not practicing Aikido as a martial art, their goal is not martial effectiveness and thus their Aikido is ineffective.
Ipso Facto, one might say. Yes, I think you are correct that this is the case. But very few people will tell you this straight out. Folks tend to be very sensitive about this area. Hardly anyone would admit that what they do doesn't work but they don't care about that.