No one actually said anything about "I'm not buying the SE for DMC 5". Ofc we are all gonna get it. But what we saw in the trailer points toward the lazy route for DMC 5 SE. For now, we only have Vergil, Turbo mode (which is already a thing on PC since long time), and Legendary Dark Knight ( no Must Style mode announced btw). Those cutscenes we saw in the trailer seems to be only the beginning and end of DMC 5 story, but from Vergil's eyes.
That means no Vergil campaign confirmed for now (where he could potentially start evolving for real), which also means no new weapons for him announced for now. If Beowulf and Force Edge are announced for him later, it will confirm the lazy route. Sure he got the Doppelganger and that recycled V's move, but it's only stuff coming from the reboot, not actual new features. We got no news for coop mode, but we got a glimpse of Nero and V fighting together in the metro mission, so I guess it work now. But even then, we don't have any mission specially for coop with unique design and features revolving around coop. This could be added with new missions for Vergil alongside new weapons for him.
My bet is that Capcom will reveal more later, because right now, the SE reeks of minimalist work. And the last thing people should do is blindly approve it, it would only encourage Capcom to keep it this way.
Also, I hate this philosophy of "Be happy with what you have and don't you dare complain". People are allowed to give criticism, especially with this. It's like they threw Vergil in and call it a day, and we should just accept it and be happy. It's not DMC 3 or 4 anymore, Vergil can't carry the SE alone today.