Ok even if you do independent events eventually you want to upload an image or a file which is not going to fit in GET very well, the url path is limited to 2k.

Ok even if you do independent events eventually you want to upload an image or a file which is not going to fit in GET very well, the url path is limited to 2k. POST you can pass much more information, also it is more secure in that is does not log the params and path in logs. Or maybe you POST to a REST url that has some params such as an api_key, then you post the data structure. Or you want to post a large JSON object of all data on a page. Again limits to GET, so people choose POST then. It depends on the situation.