I've bought the 3 Pro a while back as well, and only did the recommended upgrades at the start (bed springs, metal extruder, filament guide) and it's been print

I've bought the 3 Pro a while back as well, and only did the recommended upgrades at the start (bed springs, metal extruder, filament guide) and it's been printing flawlessly since. I haven't needed to even level the bed at all (though I'll need to replace it soon as it's all worn out by now lol). But the old Ender 3 is infamous for being hit and miss in setup, the point is that they now have the V2 and other lines which apparently just work out of the box because they're almost fully assembled, much like the old Prusas. Their head start in that area is gone.