IMO it isn't. However, I do see a huge for sending large transactions. In that sense, I don't find it too crazy that Tesla is accepting Bitcoin, because buying a Tesla is a large transaction.
I can't see Tesla BTC as anything more than a marketing gimmick for their computer geek clientele and fan base. Even if it's a logistical disaster, they probably make it back in stock purchases from true believers.
Tesla tested the waters with Elon's tweets and it shook the Bitcoin and sent it to all time highs, then Tesla bought large amount of Bitcoin and now the market exploded even further. It is a marketing gimmick, true, but it is making Bitcoin more volatile and unstable, while Tesla hoards more money from Bitcoin!
I think accepting Bitcoin as payment was tried before - it never worked since people buying it are either not selling (and using to store cash that keeps on growing), or buying it for speculative purposes via secondary instruments (gbtc, ethe).
Not really sure what’s point is for Tesla but my guess its speculative for them, with an attempt to get some additional value on cash they are starting to swim in now...
IMO a niche use though.