Totally unnecessary because it’d be a subsection within a subsection within a subsection, like having one forum for people who load bumper plates on the bar and a separate forum for people who load metal plates on the bar.
As it stands, in the broadest terms, Pharma is for recreational use of anabolics and T Replacement is for medical use. That’s about as separate as it needs to be and there’s no drastic benefit to subcategorizing AAS-related forums further. When it comes to using pharma-grade vs UGL gear, the onus is on the lifter to understand the differences/expectations/risks.
Not to mention the fact that the Pharma forum, first and foremost, does not discuss specific sources. Trying to have in-depth threads on the topics you’re talking about without actually mentioning specific brands, labs, or sites would be a precarious (and likely often-crossed) line.