I may have done Fritz a disservice here and need to correct something.
First, I’ve not heard every Fritz model, but what I’ve heard were exceptional 2-ways with excellent tweeter and mid-woofer integration. The Fritz Rev 7E in particular was a stunner and excellent value.
Let’s now talk about what I meant. The 7" mid-woofers in the Rev 7E are capable of really impressive bass for the speaker size, but the room is a tone control. If you hear OK bass, but not "wow" that’s when a little room treatment, to tame the mid-high frequencies really lets the bass bloom. At shows I’ve seen Fritz take 4 or 6 panels and put them around a modest hotel room and that is all that was needed to be among the top 2-3 rooms in a show IMHO but also in the opinion of recording artists I got a chance to talk to. That’s actually very impressive. For a speaker in a hotel room to actually sound very good with just a few panels is something very very few speakers can do. It’s not an indicator these speakers MUST have room treatment.
I’ve not heard the OP’s speakers or room, but I respect Fritz judgement enough to say "that’s not at all the product I’d expect him to build."
I don’t think Fritz speakers MUST have room treatment, but that a lot of ambitious 2-way speakers a little room treatment can make them sound much larger than otherwise.
Seriously, like the opening notes of many Universal movies have a really impressive drum introduction. Th e Rev 7E is amazing.

