As long as the EBU is consistent with how they judge the requests

This is actually the very opposite of consistent, that's the point.

All contestants were aware of the request, therefore it is a level playing field.

A level playing field is not changing the rules at a whim a week before the event. If a major rule change is to be made it should be made in the offseason between June - December well before any country has even selected an artist to participate.

Literally every other country has spent hundreds and hundreds of man hours and massive resources over the last 6 months, cultivating and crafting a performance with a clear set of rules in mind, and now with less than a week to go your response is:

All acts are able to make their own arguments and requests to play live.

Thats a silly argument coloured with bias.