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When you contextualize it like that it makes sense - emacs is something like 38MB.

The default distribution of Emacs 26.1 x64 for Windows is 677 MB.

Emacs 26.1 for Mac, built from code via `brew install emacs-mac` is 136 MB.

Compare the size to Mac System 7…

completely revolutionized

Not quite :)

The rest of the comment is spot on.

If not "completely revolutionized," then "had a really, really, really, big impact"?

By sheer volume only. When you have 90% of the market, everything you do has a really big impact.

Yep and every concept you introduce is a revolution for the general population. That's the idea.