Well worded and I agree with the bulk of your post. People SHOULD ride first and modify later and people should also try other bikes. Nobody should modify their bike because people on the internet say they have to........ and there isn't a single modification that is NECESSARY in every case except perhaps the Gen1 Doohickey. That said there is nothing wrong with modifying any bike to be better for you depending on your wants, needs, usage, expectations and budget.......and in my case I like modifying my bikes; keeps me out of the bar, I enjoy it and can afford it. You are also correct in that some people shouldn't touch a wrench......I mean if someone can't install a Thermobob without screwing up.....maybe take up bird watching....or golf.
I rode my KLR bone stock for almost 10 years before I started upgrading it. I also have owned 47 motorcycles in my life so far, so I have a pretty good idea what the KLR is and isn't. Some people want it to be a 60hp rocketship or capable of being competitive in a national enduro, or try to get it down to 300lbs......none of those things are really achievable. BUT I view the KLR as a bit of a blank canvass; a 1980's dual purpose bike hampered by budget parts and excess porkage......but with a few well conceived modifications, it can perform surprisingly well and I'll argue to the ends of the earth that there are some changes that are truly transformative for the KLR; like suspension mods, for eg. The KLR really CAN be a decent bike that can compare favorably to much more expensive and modern bikes depending on the mission.....with the right upgrades.
Dave