Of course you are justified. But there is expressing your opinion once or twice, and there is expressing your opinion over and over with the intent to cause harm and beat others into submission. You have come onto every La Cage thread that has been posted here, saying the same thing: "Arthur's was better. There's no show without Arthur."
I was a Sunday fan in 1984 (and still am). I was rooting for it that year. But Sunday got mostly negative reviews, with only Frank Rich and a few intrepid others championing it. I wasn't surprised when La Cage won. I don't think the industry was surprised either, so I'm not sure it counts as the most egregious oversight in Tony history. La Cage had mass appeal and Sunday was always an acquired taste.
And while I may not think of La Cage as one of the golden greats, it's professionally written and I sat down at this London revival, relaxed immediately and was grateful to be in the company of the Jerry Herman score. I also was more moved at this La Cage than at either of the two Broadway productions and found that some of Georges' numbers, particularly "Look Over There," worked better than I ever remembered. I had more fun. And at the conclusion of the performance I saw, the audience went absolutely ballistic, including cheering their approval at the climactic kiss between Georges and Albin. Yes, the '04 version was a failure, but this one works just fine, without Arthur's help.
Despite my love for the Whistle score, in all of my experiences seeing it, it's an infuriating show to sit through. So... if forced, I'd probably say I prefer Sunday to La Cage, but La Cage to Whistle.
Yes, Arthur deserves credit for shepherding the success of the original production. It takes a lot to create a new musical from scratch. But there's also a time when you have to allow someone else to take a look at the material and see if there's another way to tell it. It doesn't invalidate the original approach by doing so. You can choose to prefer the way it was done originally. But it's also gracious to not try to clobber those who have and will like the new production with your opinion.
Begin at the beginning and go on till you come to the end: then stop.