Next being owned by Vercel has a perverse incentice to push for features that are good for Vercel, like fast build times and very specific caching strategies, not for the features that developers actually want.
From the article, the 10x improvement was more 6x and required 30k modules... Turbopack's 15ms was rounded down to 0.01s while Vite's 87ms was rounded up to 0.09s. isn't Android build level slow.
Aside, this kind of "good enough" attitude is what brought us the JS bundle behemoths, and abstractions on top of abstractions. Even if the difference is small, it adds up if everyone thinks that the performance of their one little library is just "good enough."