I would agree with what you're saying, however I would word it somewhat differently- first of all I would agree that the healers are actually most interesting in PVP, since that is where SE showed some creative design differences even though very few skills are used for each healer, leading to no extraneous skills and there's no spamming of one of two skills to the detriment of the others.
Wit regards to sage in particular, I would also agree that of all the healers in PVP, although it brings utility it is more DPS focussed (and is more successful when played that way from my limited experience as as sage in PVP - as it's not my favourite job in PVP). However that isn't the case in PVE where it really isn't so different from a scholar