My two cents: I use more than 10 PP programs myself but caution you against overly fragmenting this forum. Splitting Adobe stuff into PS vs. LR vs. PSE leaves out ACR, Bridge and Firefly, and I bet there will be more over time. Similar splits would need be made for DxO (PhotoLab vs. PureRAW vs Nik), Luminar (4 vs Neo), etc. Where does that stop? There are so many editors out there that you'd need 30-50 forums to do all of them justice. The more forums you have, the less frequented each will be, with the consequence that some tend to die the proverbial "slow, horrible death".
Trying to use other categorizations IMO only makes matters worse. Is Lightroom a DAM, an image editor, or something else? Where do Topaz' plugins or image viewers such as FastStone or XnViewMP belong? Where does something like Excire Photo, an AI-automated keyword generator, fit? And so on and so forth. The PP landscape is not as clear-cut as such categories would require, and newer AI-based programs keep cluttering it further.
Post Processing is a good title. (I would drop "comparisons", as some discussions will be specific only to one program.) Within that, maybe address the major makes (Adobe, DxO, Capture One; not sure any others warrant a dedicated forum). Lump the others into categories wherever you can (such as "Other Commercial PP Software", "Free / Open-Source PP Software"), and make sure to offer a forum that facilitates generic discussions, where questions such as "Which PP software is best for me?" can be discussed freely.