I’ve USED the dippers, including sanding to create specific volumes, or adding drops of CA to the bottom to reduce volume. I’ve dipped and dropped directly into cases, I’ve scooped into scale pans. I’ve found it all wanting. I do still use them when loading at the range, occasionally, because they’re easily portable. They’re cheap - that’s it. A guy can feel good about $12 for a bunch of dippers which say Lee on the handle instead of $24 for a PPM they don’t want to buy because it says Lee on the lid…
You’re being exceptionally biased if you haven’t found dropping faster - and with less risk of spills - than dipping. Or you’ve not taken known opportunities to arrange your drop over your scale to eliminate hand movement. Stick a drop on a stand with a down tube over a scale pan, and a trickler beside it, things get speedy. Not as fast, obviously, as mounting the drop directly to the powder-through flaring and charging dies, but also obviously more accurate.
I think you’re also being pretty generous to claim heaping dippers by eye is more precise than powder drops. Neither are precise, naturally, and LEVEL FILLING a dipper is effectively the same as what happens in a drop, but I’ve not found the calibration curve on anyone’s Mk I eyeball to be sufficiently precise for heaping dippers to better accuracy than a powder drop. Heaping is largely acknowledgement you’re using the wrong dipper.
I do acknowledge, any of this advice is really falling on deaf ears. Multiple folks have offered the good advice to calibrate your “VMD” table for your respective lots of powder by dipping and weighing an array - but you’ve mentioned unwillingness to do so. It’s less time than charging 30 rounds, dip and weigh 10x with the 1cc, multiply to get your target dipper volume, dip & weigh 10 more with that dipper to confirm it delivers to expectation… if yes, party on, if no, move up or down in dipper accordingly.