It doesn’t look right. You can’t look at that word and simply register what it means – you notice there is a missing ‘u.’ You can understand that it correct in America, you can forgive its absence (notice there is no apostrophe in its – there shouldn’t be!) but it still looks wrong. Poor word. Not allowed to have the ‘u’ that it needs and wants.
I’m a speller. If I’m not sure how something is spelt (or spelled) usually writing it out and looking at it sorts out the discrepancy. The correct spelling looks right! Not everyone’s brain is wired like this – if it isn’t, I know correct spelling is a pain. I sympathise, but don’t want to spell it with a ‘z.’
I can tolerate deliberate incorrect spelling. I use text speak. One of my favourite novels of recent years is Banks’ Feersum Endjin. I can tolerate it, because I know there is a correct spelling, and the author is not torturing the words he uses, but teasing them.
I believe the universe has a correct spelling, and science is a joy because it is a tool that helps discover it. Quantum mechanics is a bit like God’s text speak, but it is beautiful, powerful and fun. And precise in its probability.
‘I am the truth,’ he said. Jesus is how it is spelt.