That's a pretty major deal breaker for OP to leave out of his post touting it as something to build everything in your site on (especially for a tech blog)! Does it at least have a polyfill story? I see no mention of how to make it work on, uh, the other 15% of browsers worldwide, CanIUse is telling me.

If you use it in a browser that doesn't support view transitions, the pages just don't animate. no harm no fowl

It's not that surprising if you consider that all the browsers on that page, except for Firefox and Safari, are Chrome-based