Honestly, I fully support the rewrite to Rust, but he should have just owned this from the start. I'm sure he knew in the back of his mind how dedicated he was to that branch as he had already spent the equivalent of thousands of dollars in tokens by that point.
Announcing the decision a week earlier wouldn't help anyone. Maybe he expected it to work (though he didn't say that), but there's no reason to make a final call before seeing that it did work.
Yeah but with no guarantee that it was going to work, why should he have?
But he was just working along and someone else outed his branch, right? Dude doesn't owe you any sort of explanation.
Bun was VC funded and acquired by Anthropic. He's spending company money, not his own money.