I post a lot of pics. I'd rather not resize at all.
Making it simpler to post pics is a really good thing. There are still longtime members that did not warm to posting pics on the old format. They were not dummies either, just ran into issues that were difficult or impossible to overcome.
I'm proposing the forum resize them to that size for you, not you do it yourself. Its not 2002 anymore.
I was just chucking that size out as a good "fits all", IMO.