Parmandur
Book-Friend, he/him
Waiting for 70% of the audience to approve of something is literally the opposite of "taking risks".
And that's totally fine, but don't play it off as "taking smart risks". It isn't. None of the risks 5E has taken post-release have been mechanical. The way that they're running UA, if you are correct and they are being 100% truthful about it, ensures no risks are taken in the mechanical sphere.
Actually I can think of mechanical risks, but they all seem to have been accidental - i.e. massively changing Dragonmarks for no good reason just before release of Eberron, and turning them into total junk that conflicts with the setting (where the previous design was completely appropriate).
Seems like that design was abandoned pretty rapidly, though.
They take the risks by putting them out there: they are smart by not committing to what doesn't work.