Well MS clearly states that the problems they encountered where with first gen SSDs, aka those Micron drives with horrible lags. No wonder that you don't want to depend on a drive that has up to 1 1/2seconds lag, but for the other drives they suggest turning it off.
Well neither MS nor Intel state technical reasons for it and I don't see any either, so I'm with the "turn it on" crowd, but it'd be interesting to hear from Intel on the matter.
have you solved this issue from Intel SSD toolbox?