On the topic of why folks are so interested in bed meshes, I have one reason that is a bit unique.
Basically, the build plate on my Elegoo Neptune 3 Plus has a self-inflicted defect in one spot that leaves a small dimple on anything printed over it. Some of the things I print are oriented with the upper face against the build plate and, in those situations, I don't want that "dimple" to appear on the top surface. So, my solution is to update the build plate image with a small circle at those coordinates so when positioning models on the plate, I can avoid that spot if necessary.
Doing this in PrusaSlicer was a 2 minute endeavor all through the UI. Looks like it will take a good deal more effort for Cura.