Not an ideal analogy. A better analogy is "would you hire an electrician to do task XYZ?" Nothing stopping you from learning enough to do amateur electrician work -- but at a certain point, the risk to reward ratio becomes poor for most people and not a good investment. At a certain point, you're doing it to sate your curiosity -- not an invalid motivation by any means, but it's not necessarily driven by practicality.
You say that, but it sure was nice, last year when my dryer kept popping the breaker, for me to be able to easily track down that the electrician that replaced my panel ~8 years ago had (a) used the wrong breaker for the dryer, (b) used a physically damaged breaker, and (c) improperly torqued one of the legs leading to the dryer.
Learning DYI home maintenance is not for everyone, but I sure have enjoyed it. Being comfortable with so many aspects of my house is something I really like.
Breakers were design to be installed by the average Joe, as are drier legs. The failure mechanism of an improperly installed breaker is that it doesn't work properly, or it gracefully melts in a metal box which is required by law/code to handle that exact case of graceful melting and small plastic fires.
The tools and technique required for dealing with stack of little fire bombs, that explode if poked, bent, or overheated, sometimes at a much later date, while sitting in your garage/living room, has a much more serious failure mechanism. And, more than that, most DIY battery packs I've seen involve lack of funds and Aliexpress cells. In the RC hobby community, everyone knows that you store DIY battery packs, especially those made with cheap Aliexpress cells, somewhere where they're free to spontaneously combust without consequence.
Battery packs are scary. People who understand that have better outcomes [1] than people who don't [2] (tbf, these are Lipo)
