Wait till the SD25 talk on this comes out, to first understand the rationale a bit better!
The point was that if he did the old design, which needed improving enough to justify breaking the language backwards compatibility, then why say his decisions are impeccable? Pobody's nerfect.
Again, we use Zig, and this change is welcome for us.
We also like that Zig is able to break backwards compatibility, and are fully signed up for that.
The crucial thing for TigerBeetle is that Zig as language will make the right calls looking to the next few decades, rather than ossify for fear of people who don't use it.
No-one's claiming that the people who wrote the other languages never put a foot wrong, so there's no claim of perfection to knock down with them.