If it’s boomy, it’s not located properly, crossed over properly or set to the correct level.
I kind of disagree. I mean, this all depends on how many options we have available to us to fix a problem. One of the most common is that there are big peaks that need to get clipped. OK, so what if I can't move the sub? Well that forces us to choose too low a level for the sub. An EQ though, with or without bass traps suddenly opens up a range of possibilities.