Part of the insanity is the tools. These tools are designed for premixed drywall compounds but work well, IMO. I haven't done a lot of major mountain building but for skim coats, feathering edges, adjusting grades most any wall or floor compound material will work.
This 1/2" elevation difference is feather-in with a few coats of compound and sanding.
More expensive ground cover materials are used to a minimum after the grades are adjusting with most any plaster/filler compound.
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