I’m going to make a bold statement. I think your missive is as one-sided as that other photographer. I think you’re both wrong.
When I am out in shooting I do not have the luxury of time to endlessly fiddle with the camera settings to get a JPEG. And that JPEG is the one the camera algorithm produced as opposed to the one I could produce in Adobe Lightroom. If you are happy with your JPEGs. Great.
Most of the time, nothing I see in the camera is what I want the final result to be. The camera NEVER sees what I see. It’s just a starting point.
I shoot in RAW+FINE. I keep the RAW file as my negative. I toss the JPEG file into social media. Then I download the RAW image — my digital negative — into Lightroom and manipulate it to create what I want to create.
I don’t toss my film negatives into a fire and only keep the print interpretation of that negative that CVS/Walmart provide me.