I do not at this point. IE is going away at the end of this year. Edge has long been pushed as the replacement.
FWIW, I check for the existence of Promise now in Reactor, and if it isn’t there, I stop/alert. Unless eZLO decides in later firmware to add a polyfill for it, it seems a good lightweight way to detect even the most modern IE (and in my case, a polyfill would probably work fine).