I see absolutely nothing wrong at all wanting to experiment with radio by setting up a part 15. A lot of people do it. It’s not supposed to be be professional; it’s just for fun (akin to me spending time in the garage tinkering with my car in my spare time).
Some of the radio pros may not see much value in setting up a hobby radio station because they’ve had the opportunity to play in the big leagues. After you have a chance to spend some time around a real radio station, a small hobby setup naturally isn’t going to be as interesting. But with that being said, we’re talking about something fun that a hobbyist will get enjoyment out of. The worst thing that could possibly happen is that they develop a deeper interest in the art of radio and then want to do this professionally… Even then, I still attribute my time on the professional side to be the single best thing to ever happen to me. It helped a painfully shy 18 year old kid with an interest in radio (and virtually no knowledge whatsoever) become more confident and do things I never could have done without this experience. Now I have unlimited confidence, and can take on all sorts of challenges (because nothing was harder than being told that I need to fill in for a morning show by myself and somehow make it all come together work). Of course, I failed massively… perhaps even epically… But I kept trying and got better. That experience makes everything in my life seem easy now, and my problems minuscule. My current boss at my office job asked me to give a presentation to half of the company, and I was able to absolutely nail it. I attribute that success to the growing pains of radio and having to make it work.