I've only use JSON Patch once as a quick hack to fix a problem I never thought I would encounter.
I had built a quick and dirty web interface so that a handful of people we contracted overseas can annotate some text data at the word level.
Originally, the plan was that the data was being annotated in small chunks (a sentence or two of text) but apparently the person managing the annotation team started assigning whole documents and we got a complaint that suddenly the annotations weren't being saved.
It turned out that the annotators had been using a dial up connection the entire time (in 2018!) and so the upload was timing out for them.
We panicked a bit until I discovered JSON Patch and I rewrote the upload code to only use the patch.