If you like the sound signature of the Axiom and it sounds like you.
Then definitely I'd look at the M80 or the M100 if you can swing them or find a deal on them.
I really have no idea why anyone would give advice on that stepping up to a 3 way speaker with twice the drivers wouldn't a big enough increase in sound quality.
One thing I've come to realized is that most dont know anything about the history of the product they are advising on and are really just going by what's popular.
Ian and Andrew at Axiom are brilliant designers. They are part of and build their speakers at the NRC of Canada. Have work/learned from the best and the likes of Floyd Toole and Ian Paisley (one of my personal favorite speakers designer's)
Axiom speakers are beautifully designed and built. I'd definitely movie up their line.
I do agree that moving away from the BIC subs (as finances allow) to ID companies like HSU and Rythmik along with others is a great idea.
Orotund Desert Theater:14'x20'x10',100amp service, JVC RS620, 120" AT screen, Carada Masquerade Masking, OPPO-203 & Panny ub820, Anthem AVM60, Simaudio Moon Titan 7&5 channel amplifiers, ACInfinity Fans, L&R Polk SDA SRStl Fully built, CC 2 Polk RTA15tl in Custom cabinets Fully build, SS-BS DT BPXV, 4 Atmos 3 way Core5's, Subs-Rythmik FV25HP front 2 HSU VTF-MK5-HP back, 2 Rows of 3 Seatcraft Excalibur Lx Seats and more.