I haven't heard many people claim it to not exist. What most have said in that regard is that it isn't great for the GF for all the reasons around the metal aspect in the main. The results bear this out. There is actually far less Victorian bias in denials than there is non Victorian bias in the reverse claims and that is very evident in your post.Of course it's mostly mental. The game is is still 22 v 22, the ball is the same, but home ground advantage is a thing and the records in all major sports prove it. As a Port supporter I am all too aware of Malthouse being able to get a far less talented side up, home ground advantage is not insurmountable or unbeatable, no body is arguing that. But it does exist, almost all will acknowledge that...... just for some reason not by many Victorians in relation to a solitary game..... that's different, cause you know, it's tradition, it's Mabo, it's the vibe.
Whatever the pros and cons or of either arguments the results are an unbiased barometer.