Quoting your post:
"First, the most important thing one should remember, is Sarapis
gave the infernals that skill for a reason. It is like any other skill,
and one organization has no right to tell another that they cant
used their god given skills. Much like telling a Druid they cant
have a grove."

Groves, for druids and sylvans is a whole skillset, not a single
ability. Telling them to not have a grove is like avoiding monks to use
Kaido.

Quoting again:
"Oakstone also is some sort of weird entity, not like a city,
but more like a organization, which decided for themselves
they can control all herbs they want.
kind of an interesting enterprise tho."

Oakstone does not even pretend to control all the herbs they want.
If you take the pain to read HELP OAKSTONE you would understand that the
purpose of Oakstone is to protect and care for the Nature. For this
Oakstone can SUGGEST peoples caring for the same purposes to do
something avoiding arm to Nature.

Eleahfahr, Heirophant of Oakstone

Penned by my hand on the 19th of Miraman, in the year 349 AF.