Should next gen systems be fully Backwards Compatible from Day 1 to encourage people to upgrade?

[DonFerrari]

RaptorChrist said:
I have a PS4 Pro in my room / my wife's room, my daughter has a PS3 in her room, and we have a regular PS4 downstairs in the living room. I also have an extra OG Phat PS3 that I occasionally use when I need to play a PS3 game in my room. Backwards compatibility is nice, and I expect it will be there when the PS5 arrives.

There's no purpose in me keeping three different devices that can play PS4 games, but Gamestop really shorts people where I'm from, and selling one of them on something like eBay is so much hassle that I only see myself doing it if I'm really short on cash (which you never know).

This thread conjured up an idea in my mind maybe worthy of it's own thread. What about forwards compatibility? What about if Sony allowed devs the capability to tune their games in a way that allows them to run on both PS5 and PS4. It would allow people to purchase PS5 games at launch without owning the console, and will allow for game sales to not be staggered so much at the start of a new gen.

Kind of like how at the start of the PS4 gen, many of the AAA games at the time were being released on both PS3 and PS4. This would effectively be similar to that.

Crossgen just hold down the scope the game could have being just nextgen. I rather play the best version I can.