I have wondered before if it is possible at all, to report or point out failure due to incompetence while staying nominally polite. I dont think it is possible.
What we need is the humility to accept mistakes and to not clutch responsibility and authority (and compensation) when it is clear that the person or group cant do their responsibility justice.
What we need in particular is to remove incompetent people from a chain of command or approval who dont help progress or solve issues. Helping issue can come in the form of data of "it doesnt work for me".
since it seems unavoidable to be rude, i dont think anyone needs to hold back with accusations, particularly if it concerns public or semi public interests.