Pressure advance has been around for at least a decade with many people using it.
I would say the biggest gain for the newer (cheaper) printers have is the input shaping and resonance tuning. This allowed for running higher accels/speeds with a machine that is less mechanically sound. Followed closely by the lack of slicer options and forcing use of branded filament, eliminating those choices makes it easier to make a slicer profile that is repeatable (in my case I have been using Atomic filament and the same basic slicer profile for close to 10 years).
In my shop...I still don't use advance or input shaping...but I build machines with very solid frames. The gains from input shaping seem to be less based on how solid the frame/motion is (based on what I have seen). Current printer is ~10 years old, still solid. Not as fast as the corexy (due to leadscrew drive) but prints very well and has a 320mm cubed area. Without pressure advance or other magic tricks I print at 100mm/s with PLA @150-200mm/s travels, not to mention I have a very heavy extruder.