Well sure, but if you find synergy in the combination that could also be an effect of the potentiation. Maybe there are tons of people who experience the combination as nothing more than a strong experience but what we're dealing here is also a potentiation of possible negative effects. I know of people who died of MDMA alone, you can react really badly.
What I personally believe in is the possibility that 2C-T-x's increase this risk because they have a bigger load, not much more actually. I'm sceptical about MAOI as a mechanism as well, but I still wonder what the hell went wrong with those 2C-T-7+MDMA deaths and prefer to avoid such combinations as a precaution.
We're dealing with substances that are less investigated than we would like, there's no need to tempt fate.