All these rationalization still can't change Roboto as a whole is not well put together and has severe identity crisis. When your team look disjointed and at odds with each other, really there is no win in technicalities.

Besides, fonts are art with utilities, you can try to repaint Starry night again and again (each time more modern and technically advanced), Van Gogh is not perfect should not be the reason. I find Glenn Fleishman faulting Apple for not having an episode of Not Invented Here Syndrome rather baffling.