Would love to see where all the folks from 5 years ago, breathlessly declaring it's futile to start a new browser project, are now and what they are doing with their lives.
Showing how far one can go with modern AI tooling does matter only a little when all you do is looking at Chromium/Firefox code and recompiling the logic of it in another language.
I'll stick with Firefox.
Where was the market share for browsers in the 1980s?
Okay, sure. What was the market share for Chrome in 1999?
There are legitimate arguments against Ladybird. But pointing to the market share of a non-existent product, in a category on the verge of a paradigm shift from AI, is not one of them.
Is that what Ladybird does? Can you point to a real world example? From the blog post, it seems there are real world differences (look at the performance when resizing with heavy JS!).
You're also mixing arguments. The original arguments against ladybird (which I vividly remember as I loved following them back then) were that it would be impossible to arrive at something that works for all use cases. Ladybird would be able to render toy websites like hacker news, but nothing of worth.
It seems they were proven evidently wrong.