My use case is also to receive e-mails from non gmail/outlook users. In fact if I check my logs 1.5% of messages came from google's smtp service and 1 from outlook, out of last 15000 emails.

So if big provider drops 95% of incomming emails from non-big providers into black void, their service is less than useless to me, and their quality would be at par with small providers that can deliver 95% emails successfully.