The full Instant Games SDK is pretty big. It covers things like bots, multiplayer matchmaking, localization, IAP, advanced analytics, etc. It would be a considerable amount of work to fully implement it at the expense of everything else we have to do, and meanwhile I'm pretty sure some of those features would go largely unused too. It is much more feasible to implement feature requests if they are small and specific. For example if a suggestion asks "implement IAP for instant games", I could entertain the idea of making some time to work on that at some point fairly soon; but if a suggestion asks "implement the full SDK" then that is such a big job with questionable utility that I'd probably put it off as long as possible, which might mean none of it is done. We have to ruthlessly prioritise. Accordingly, the best suggestions are scoped to just the most useful part.