On a recent project I have needed to use exFAT. exFAT is terrible for a number of reasons, but in my case the thing I had to deal with was the lack of journaling, which had the possibility to corrupt files if there were a power interruption or something.

I initially was writing a series of files and doing some quasi-append-only things with new files and compacting the old one to sort of reinvent journaling. What I did more or less worked but it was very ad hoc and bad and was probably hiding a lot of bugs I would eventually have to fix later.

And then I remembered SQLite. I realized that ACID was probably safe enough for my needs, and then all the hard parts I was reinventing were probably faster and less likely to break if I used something thoroughly audited and tested, so I reworked everything I was doing to SQLite and it worked fine.

I wish exFAT would die in a fire and a journaling filesystem would replace it as the "one filesystem you can use everywhere", but until it does I'm grateful SQLite exists.