> You only download it when some JS requests it for the first time, most people will never have it.

i certainly never activated it willfully. i use Chrome only as a fallback testing platform for web dev - a handful of times per month - yet both Chrome Stable and Chrome Unstable had installed this 4GB monstrosity in my home dir. 8GB of junk i'd never used. Both have since been uninstalled and replaced with Chromium.