I'm even not sure what an average experience on IE11 would be for any users.

I push as much as I can to POs / stakeholders to just disable non-critical features on IE11 and just leave the basic functionality.

I doubt anyone using IE11 likes that fact, so sounds good to give them just another reason to complain about their experience to their superiors. I will definitely never see "The product that just works on IE11" as a slogan, so being competitive in this won't be reasonable argument.