Disagree whole heartedly. The benefits of ortho is minor compared to the split, but it’s still there. And if you’re already willing to buy an expensive split mechanical keyboard, what’s the drawback?
Counter anecdote; I switched to split ortho a couple weeks ago and it didn't take much more than a week of consistently using only the new keyboard to get back up to normal speeds. The ortho seems to have made it much easier for me to touch type, as a result of which I now make fewer errors and generally barely ever consciously think about the actual action of typing.
That's what happened for me, at least.