yes, many guys that run two amps live delay one amp by a few ms to avoid phasing issues, although i wouldn't say it's necessary.
i'm running an engl fireball and peavey 5150 in stereo for my single guitar band. i'm using an morley a-b-y switcher which is great. only downside is that you might run into ground loop issues. not too much of a problem with the engl as it has a built in noisegate, but kinda sucks for the 5150.
there's a rather cheap device from behringer though that's built to eliminate ground issues (forgot the name)....basically you plug it between the splitter and the amp. works like a charm.
there's also a lehle splitter that handles the ground stuff, but this one is pretty expensive.
sounds crushing btw. especially leads sound wicked. for leads i'm using a boss delay. actually i got the dd7 because of the stereo option, but i've quickly switched to using only one amp with delay and keeping the other one dry all the time. sounds awesome.
as for using two amps in general, i wouldn't say that there's no point in doing so....depends on the material. for straight up death metal or similar you can get by with just one amp, but there's just something about having an amp on both sides of the stage, switching one of them on and off to emulate the effect of having only one guitar play something and the second one kicking in etc. and obviously, if you chose your amps wisely it sounds crushing as fuck.
many people (keep of kalessin and rage for example) run two amps, with one of them using very little gain to really get the note through, and the other one adding thickness and sustain.
