Is there any good reason for Homebrew to keep its .tar.gz files around, even after packages are installed? I'd personally love a "Homebrew light", compatible w

Is there any good reason for Homebrew to keep its .tar.gz files around, even after packages are installed? I'd personally love a "Homebrew light", compatible with most of the ecosystem (sans git taps, Ruby formulas and binary packages), written in a language with fast startup times, not keeping unnecessary files on disk, with support for parallel downloads, and terminology that is much easier for the newcomers to remember and keep straight.