Surely race driving vs everyday driving is actually a closer analogy to 'playing different roleplaying games' than the semi was? If so you seem to have conceded the point.
No. Race driving requires you to understand the physics and handling of your car, useful for anyone that ever needs to handle the unexpected when driving. I would also note that the course I took was with standard production vehicles, not NASCAR or formula 1 race cars.
Can learn something from reading articles, sure. Will learn more from actually doing? Also sure.
I can read dozens of articles in the time I could play a single other game for long enough to really understand how it works.
How could it possibly hurt? The other game cooties infect your brain and kill your D&D cells?
How could it hurt? It takes away time I and my players have a lot of fun playing D&D. It would take time away from something I enjoy, not to mention money on books or pdfs I'd rather spend elsewhere. All for the possibility that someday I could come back and ... what ... have more fun playing D&D?
In my spare time I sometimes read, watch streams and videos to see if I can learn something. It's a far better use of my time and can happen when I want or have a spare 15 minutes. I get far more variety of input, viewpoints and information than I would get from dozens or even hundreds of hours of play. Instead of buying the rules for and spending the time playing Daggerheart, I can watch a video on how to play and an actual play stream while I exercise. I may even do that sometime this winter. If it sounds really cool and something I'll enjoy more than D&D or just want a break from D&D or I thought it might be okay and had multiple players asking about it? Then I'll consider it. I won't play the game because I think I could glean anything more than watching those videos, I'd do it because I thought it would be more rewarding than playing D&D for a while.