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Thanks for the correction guys, I'll edit my post so that it doesn't show wrong info.
The issue is that some wallets and service providers (exchanges, gambling sites, webwallets etc) do not support Native "bc1" addresses at this time, so you can't send from these services to a "bc1" address... As they are likely to flag a "bc1" address as invalid and refuse to send to it.
I guess this is why I confused things up.
So just to get things totally clear, services already support sending to P2SH addresses and that's why they all support sending to nested SegWit addresses?