That depends entirely on your definition of "behind".

The MK4 delivers pretty much the same quality at the same speed as the P1P.

Paying 30% more to get an open-source, fully modular, fully repairable and customizable product that's made sustainably with fair wages is not a huge markup.

I'd gladly pay 30% more to get an Android phone that's fully modular, open-source, repairable, upgradable and made in the EU.

The speed of the MK4 for the same quality isn't even close to the P1P due to it being a bedslinger vs CoreXY gemoetry.

That's... quite misleading? The MK4 with input shaping is limited by extrusion speed, not the motion system.

The printers are both pretty identical in performance today. And while CoreXY has significantly more headroom in case you'd like to upgrade the current bottlenecks, that's not an option with the Bambu printers anyway.

Speed isn't everything, especially when more speed means more noise

While Bamboo etc are one head in front of Prusa now, they are still very close in the context of printing weapons. I mean, neither are particularly suited compared to a CNC mill or lathe. And both have come quite a long way since what we had 10-15 years ago, when FDM for non-industrial users got started.

This is true, they'd gotten too complacent and now Bambu is eating their lunch.