My first intro to magic was the original Mirrodin block, when I started reading the novels. It's always hard to return to new phyrexia and see what they've done to my entry point. These stories in particular felt unfulfilling. It left me feeling rushed and pointless as the heroes arrived too late to stop the bad guys as the trope goes but they also lost so many of their number. They, perhaps, at best killed Tibalt and lost Jace (who could be an incredible asset to Phyrexia), Vraska, Nissa (also potentially a great asset), Lukka, and Nahiri. Not sure how Tyvar and Ajani turned out and Elspeth basically threw herself on a grenade.
I honestly don't know a lot about the Sylex but is it really capable of destroying a world? The entire universe? I know Dominaria survived the explosion though they suffered greatly so it seems a little farfetched for the bomb to threaten all of reality. Also, on a bit of a logistical level, where did they get *millions* of forces to invade with??? Mirrodin was not THAT populous to begin with so have they been kidnapping people for a long time?
I'm guessing we're going to see various planes fighting Phyrexians and I hope some planes pull a New Capenna and win against them. I do not look forward to "here's a phyrexianized version of something you thought was cool!" for multiple planes. I expect to return to Ravnica and see some guilds getting compleated.
I'm just tired of cool and pretty things being twisted and mutilated for the shock factor. It isn't compelling to me, I don't get an urge to "fight for them" I just lose interest. Although I do find it kind of funny how little Nissa matters as anything more than a plot device. She was a secondary character in Lukka's story and got hunted, captured, and compleated entirely off screen.