My question is: I never see anyone factoring in the Samsung capability and strategy to provide the end user the ability to upgrade the hardware, software and firmware by shoving in a new card in a slot on the back of the machine.
IF Everything Else were equal, MIGHT let that be a deciding factor.
Otherwise - and based upon reports of Samsung's LACK of support for their older blu-ray players (albeit from an admittedly small sample size) - would not put any value on that.
In fact, rather like the Recommendation to IGNORE the Web Apps on the "Smart Tvs" - from any company - and instead pick up an external box for that function.
We have a handful of components that were supposedly designed with "Future Upgrades" in mind - whether by swapping cards, or plugging a new board into an "Expansion Slot." Exactly NONE of these has ever received a PHYSICAL update - only downloadable Firmware / Software updates, and even at that (for the most part) only within the first year or two of ownership.
Unless you are buying TRULY High-End gear - like, for example, a RED Camera - would not count on very much R&D going to Upgrading older models.
There can ALWAYS be Exceptions, of course...