Gimp, Inkscape, and Scribus were terrible to use after using Adobe for years. Get Affinity suite instead and save yourself the rage and frustration. It's one-time payment license (not a subscription) and they have deals. I got the license for the three of them for $90. They are way closer to Adobe products and definitely worth the one-time cost.
I love the concept of open source, but you can only make so many compromises in quality and usability, especially if you're likelihood depends on it. Gimp, etc just aren't there.
(On the other end of the spectrum, Blender is so amazing I can still hardly believe it.)
You need to check your reading comprehension. I never said there's any such dichotomy about FOSS as a general concept. I specifically named Gimp, Inkscape, and Scribus before and after that sentence. Just because a FOSS "alternative" exists, doesn't mean it actually is an alternative, or at least an acceptable one. Each software has to be evaluated individually. In the case of Gimp, Inkscape, and Scribus, they would not be acceptable in a professional creative space.