This argument seems odd to me. I regularly use a generic USB-C-HDMI adapter to connect my S9 with a projector. Once the phone is connected, it immediately offers to switch to DEX mode which works flawlessly. Since neither the projector, nor the generic adapter contain any DEX hardware/software element, the S9 appears to have everything which would be needed. For me, it seems like SAMSUNG simply limits the functions and usability of the S9 to force the user to upgrade.
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