Even Max who likes it admitted that it can mean differnt things to differnt people. So that certainly means it is not an useful way to convey information.
No. That's not what that means. Something can mean different things to different people and you can convey useful information that way.
Your sentence would eliminate all art in the world of all kind if it were true. It would mean all music, all paintings, all photographs, sculpture, theater, everything artistic in life conveys nothing because it can mean different things to different people.
It's OK for a element of a game to convey different things to different people, and still be of value for the game over all.
Alignment proponents claim that alignment is simultaneously so flexible that people can interpret their character's alignment how they want but those two letter will tell the GM how to run a monster. This is simply a logical impossibility, both can't be true.
It is true though. But, let's be clear. When you say it cannot be true, and others say that's how they've been using it, you're calling them a liar. If you disagree, tell me how you're not calling people a liar when they say they've been successfully using it that way and you say it cannot be true?
There was someone in this thread (or some thread) who found AD&D's different weapon damage tables against giants useful. Someone somewhere will always find anything useful, but cluttering game with all sort of nonsense with the caveat that 'if you don't like it don't use it' is not a good way to design games.
Right, we only go with the elements which a meaningful number of people find useful. Which includes alignment. See every poll ever taken on the topic, which always shows a minimum of what I think we can all agree are a "meaningful number" of people. Which makes it "not nonsense."
It leads to the game being bloated incoherent mess.
The game has been the most successful version so far, and it's not commonly called a bloated incoherent mess because alignment was in it. So that's empirically false.
I am advocating for what I see as good and coherent game design here.
I have yet to see your replacement system?