You just made my point. You can't "train to tactics" in a short time, there is a huge difference in being familiar with and being an expert. It is possible to be an expert in tactics even if you don't have a specific enemy to train against.
I'll use an example from my community. Experienced crews taking 15-20 minutes to get a Hellfire off the rail. That's completely unsat but it's commonplace.
I'm also not advocating overlooking required stuff such as maintenance, etc, but it is possible to be good at both.
Yeah, but that doesn't sound like "tactics" it sounds like "(lack of) proficiency in the basics."
Maybe it's getting in the weeds on semantics, but generally when a discussion turns to "tactics" I assume a certain basic weapons proficiency is a given, since "tactics" tend to be developed from an assumption of a baseline proficiency (and therefore Phit/Pkill/etc)...no?