Provide clear support statement for SPFx with IE
Right now there is no clear statement regarding the supportability of IE with SPFx. Since IE 11 is still supported for O365 and SharePoint Online, customers assume that it is supported with IE as well.
Currently SPFx is impossible to use with IE because of performance issues and very bad memory leaks in IE. The more content and web parts are on a modern page the worse it gets. Thus, I suggest that you either fix those issues, or make a clear statement that SPFx is not supported with IE anymore. This would really help customers in making their decisions.