How to make it a "Framework with a small footprint" again?

v4.2.9 has 24MB right after installation by composer appstarter.

If you remove  Composer packages only for development;

Code:

$ composer install --no-dev

It will have only 5.5MB.

Nice hint
My 'vendors' folder has got 50 times thinner
This is partly in the documentation, but perhaps it can be emphasized