Flash Wastes My Time and Hogs Memory
Your first reason has a corollary, which is why I MYSELF obominate Flash: it hogs memory, and, as a browser extension, creates disastrous load times for otherwise inocuous web pages. Besides, I never ever want to see a graphic or a pictiure or a video, unless totally bvoard and watching downloaded movies or music videos.
As to browsers, I use IE foir most things; chrome, palemoon, and forefox for my recreational stuff, all three of thoise are totally locked down against any possibility of modificatyion, and do have acess to locked-down versions of flash.
IE does not have access to flash.