Part of the issue here is that, Animal Farm is less about the failures of socialism as a system, and more so about the failures of a potential socialist revolution.

The revolution is a failure because it's violent and aimless at first and quickly hijacked by power hungry individuals who find more clarity in their common hatred for one kind of leader than actual pursue of collectively owned means of production.

Even then, there are flaws to the fable which can't be ignored. Animals are truly not equal because they are different species, hence why you will find some naturally more talented at some tasks than others. Humans are all equally capable of performing human tasks. Admittedly, some are born with disabilities or otherwise lacking in this or that skill, but we are technically all "equal". I find this aspect of the fable flawed as representation of human character, and an unnecessary oversimplification of human nature.

I do find it funny how people seem to miss the point that the pigs being as bad as the humans means that these are also, you know, bad. The pigs quite literally turn into humans at the end. Orwell was a democratic socialist. I mean, do I even have to say it? He's saying that this is an ineffective way of getting rid of the ruling class and that we should be wary of "saviors", not that the ruling class is acceptable as long as they aren't communist.