Shurrikhan explained it well

Also, granting everyone a DoT does nothing but make the game more homogenized than it currently is.
When I was told "The summoner is a Doter", well.. everyone has between 1-2 dot and a few jobs got 3 DoT.
So the Summoner was hardly special and unique by applying DoTs.

Removing DoT that don't do anything but add 1% to your overall damage is a good way to make job less homogenized.
Same goes for combo or position requirement.

If Monk were the only job heavily dependant on position for combo, then it is a core aspect of the job (that you could later expand)
If every melee have half their skills based on position, then it is just... baseline, it is not a core aspect of the job.

So removing things that promote nothing isn't a bad choice.