Sure, I understand what you mean. But for smaller apps, it’s still a considerable difference.
Of course, it’s not a big deal today, but one of my last mobile projects has size (< 1 MB) as a requirement due to distribution limitations - distributed via Play Store/App Store, but on places with very poor aggregated connection. The app was small and data was downloaded from a local proxy.
Also, for single-purpose utilities, Flutter may be too heavy.