You're done here.
Way to be selective and not include the rest of the sentence.
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It doesn't matter if it is a small portion of their viewers, which to be honest I highly doubt to be insignificant; Netflix is a paid service and should implement features that the users demand. Your suggestion that people can't watch the movie/show if it is playing in PiP simply isn't true, regardless of whether it is true for you or not. PiP isn't missing, and i'm not sure you understand how it works - it isn't the only way to watch so obviously wouldn't be used on a date.
They DID implement the feature. You're just not happy it took longer than expected and that it doesn't work on iOS 10 beta. Payed or not, it doesn't matter when they add a feature. That's 100% up to them. It's their product, not yours. You don't get to say when and how things are implemented. They have no obligation to fix it for iOS 10 beta either. It doesn't have to get fixed until iOS 10 releases. If they fixed it now, it could just as easily break again in beta 4, 5, 6, 7 or 8. Which would cost them more money. Maybe the issue can't be fixed using iOS 9 SDK or API. If so they can't release a proper iOS 10 fix until GM.