Why do those fixes matter? Again if you're in a closed environment then you can surely control the versions of a JS library. So fix it until it works in your space then move on. Them dropping support for your outdated choice of platform isn't a problem. Your desire to use cutting edge software with your outdated platform is the problem.

Picking a platform and sticking with it is a nobel and occasionally needed position to have. Expecting everyone else to hold themselves back because you chose to do so is impossibly greedy however.