[yourad_io]

> homegrown garbage collection

You could say the same about shadow dom rendering: "Your own homegrown DOM renderer?". But in practice, it has a good reason to exist (performance vs. real DOM) and nearly zero usability issues (it is completely invisible to the developer, "it just works").

If they hadn't considered "garbage collection" (cache eviction, really) then it would have been seriously difficult to manage from outside Relay (and would partly defeat the point of using it).