No it wouldn't because there's to many variables involved in a parse that you cannot get any accurate results from it.
I could do sus ex and come out with 3k dps using my current rotation
I could then turn around and say right gonna use all my ninjas dualities on shadow fang instead of Aeolian edge.
I could then say I'm gonna do Fuma > hyoton > huton on all my tcjs.
both of those things are quite obviously bad ideas. yet it's still incredibly possible that even doing those things i'd actually come out of the next sus ex party with a much higher parse maybe 3.3k than I did the last one. a few good ast cards or crit buffs and woooo more dps....
Also if that parse the ops suggests is personal only then there'd be no information to explain that dps increase. so it creates a false reading and players then make bad decisions. (man this new rotation is 300dps better).. because now a player might think that duality shadow fang and doing the huton combo for tcj is the best choice becauase a parser apparently says so..
You simply could not make any accurate conclusions from a parse especially a personal only one. because its simply impossible to account for every variable.
If you want to make any remotely accurate tests of rotations and the like you need a consistant environment in which to test and get accurate and comparable results.. it's the same thing scientists do. if you want to test something accurately you need to eliminate every single variable except that which you are testing.. so if the variable you want to test is your rotation. you need to eliminate party compositions, mechanics, party buffs, variances in up time. only then will you get an accurate reading of if a rotation is actually better or not.. a parser in a fight simply cannot do that.
the only place then to get an accurate test of a rotations potential then is SSS or it's 4.0 equivalent. because it eliminates every variable except your gear and your rotation... this then means that any results you get are directly comparable because there are no other variables..