I have known some people like that, and I can say I understand them (that’s not the same as saying I agree with them): the ones I knew were focusing their efforts in creating products (images, customer orders, …), and not by finding out how to do something with a new software. They didn’t want to waste time asking or waiting for something to be implemented. To me, that is understandable. And they went the easy route: keep using Adobe products.
Maybe the biggest advantage of Adobe products are not the products themselves, but the incredible amount of help, tutorials and companies willing to sell products oriented towards ease the learning curve of Adobe software. You want to know how to do something with Photoshop? Just a quick search and you have literally hundreds of solutions.
To me adding a feature to a FOSS program is useless if almost nobody knows how to properly use it.
If you’re new to a free program and find yourself playing with sliders to know what you can get, without a quick and easy way to find some help, there’s little doubt you will close and forget such program.
Perhaps what FOSS programs lack is help: not only this forum, but a quick Google search that will give you several ways to do the same. That is, aside from this forum, webpages with tutorials. Same as with Adobe products: do this, click there, save the result
Something like this for Darktable, or this for RawTherapee, but like a thousand more 