The advantages of digital filters go way beyond ease of experimentation and tweaking. Analog filters simply cannot do what digital filters can. Designed properly, they are far quieter, drift negligibly, can be phase linear, have less ripple and faster transition and higher attenuation than their analog counter-parts. They can be used to eliminate high Q and low Q resonances very easily which is a very complicated and expensive thing to pull off with analog particularly if you have many resonances to deal with.
Regardless of how flat the M2 response looks, it is not as linear as the digital LFRs. I can hear the difference in accuracy without trying even at quieter SPLs. The first immediate difference is the bass and lower mids and the second is image separation.
