I'm going to go the unpopular route and ask, how mission-critical are fonts, really? Protected fonts such as these can't be mission-critical, legally, right?
Never felt myself lacking for fonts in Docs, myself. Quite the opposite, Google Fonts has way more than I'd ever have preinstalled and is now my primary avenue for typeface discovery.
Depends on what you do.
Are you building a slide deck on your systems architecture? Probably doesn't matter.
Are you building a marketing deck on your new corporate identity? Probably matters a lot.
Either way, the tool I'm using shouldn't be the one deciding what matters and what doesn't. Just let me use my font as I please!