I'm sure Joey could put out something awesome working with any of these bands, but really, it would be nice if ANYBODY who really knows what they're doing and consistently puts out great sounding stuff could work with one of these bands. I would love to hear Veil of Maya, Born of Osiris, After The Burial, Periphery, Tesseract, etc. put out a pro sounding modern metal album without any blatant flaws dragging the mix down. I like all of these bands, but the mixes are always disappointing.
Most of these djent bands all take the DIY approach, and they're all copying each other, buying and using Axe-FX for guitars, using Superior Drummer for drums, and ending up with mediocre sounding albums filled with great music. It would be awesome to get great music AND a great mix. Unfortunately, it seems to happen very rarely...
There's nothing wrong with the DIY approach. I know cash is tight, and I fully support it if the people know what they're doing... but the majority don't. Take the time to learn & buy the gear needed to get it done or let somebody else who knows what they're doing better than you do handle mixing so you can focus on your music. I know a lot of these guys are talented musicians and want to have control over EVERYTHING, but they could really benefit from an outside perspective.
Also, it seems like quite a few of them are buying the Axe-FX as a status symbol. They see their peers and musicians they look up to (who may not know anything at all about mixing/production) using things like the Axe-FX, and so they think they must have the same gear to be taken seriously or be considered part of the same clique...
It doesn't have to be like that though. These bands don't have to continue copying off of each other and repeatedly spawning mediocrity. I would say Within The Ruins and The Contortionist are both bands from the same scene/same genre of music, and the recent albums by both of these bands (Exoplanet by The Contortionist and especially Invade by Within The Ruins) are quite a bit better sounding than what you usually hear. No Axe-FX, no Superior Drummer, no DIY mixing/production, and the results are GOOD.
I know these kinds of bands have a ton of younger/less demanding fans (cough, sevenstring.org, cough) that couldn't care less about how the albums sound, but I think there are a lot of people out there like me (probably a good amount of them here on this forum) who really genuinely like a lot of this music, but are disappointed by the mediocre mixes & endless copying of fads.