I disagree. OSS is only ahead if there is no money in it, like new programming languages. Whenever it is profitable, OSS projects just cannot compete with professionals working full time.
OSS is usually reinventing the wheel free from commercial pressures (Linux, GNU, Apache). Or they are previous commercial products (Firefox, LibreOffice, Kubernetes, Bazel).
You're comparing household name with household name. Commercial software has a marketing budget, but free software spreads more by word-of-mouth (or association with a big and processional organisation like GNU), so that's an apples-to-oranges comparison. GIMP isn't very good, as free software image editors go: Script-Fu, plugins, or UI familiarity are basically the only reasons to choose it these days.
I'm curious as to which ones they do not have compared to Adobe products.
The only one I can think of is proper material layer painting in Blender, you can get there with addons but haven't found one that's as good. Genuinely the only thing that I miss, and I do this full time.
Darktable has some features that RawTherapee doesn't, and vice versa. I imagine that some of that stuff isn't in the Adobe software. (I've heard that recent versions of Lightroom have removed local file management support, which both these programs still have – though don't quote me on that.)