Perhaps, but that doesn’t stop me from digging my Weber in actual use, I like it better than what I’ve tried even with speaker sims but I’m running my Weber to a full stack of Vintage 30’s and I have no complaints.
I certainly would try a Rockcrusher, almost bought a used one locally, but the demos I’ve seen of those don’t leave me scrambling to find one.
Correct me if I’m wrong: Isn’t the mass motor inside these Weber Mass attenuators reactive? The signal goes through a speaker driver motor that allows interaction to the amp output transformer which has a positive impact on the amp and tonal impact.