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I wonder if Piece Type Density needs to be considered in conjunction with
Move Type Density. FIDE Chess has six piece types in 64 sqaures and also
has 7.5 move types (King, Rook, Bishop, Knight, normal pawn move, normal
pawn capture counted at full value; Castling, Pawn double step, and e. p.
counted at half value.) No move type for the Queen as it combines the Rook
and Bishop.

Capablanca's Chess has 8 piece types on 80 squares, but has type same 7.5
move types. Does this mean that Capa's game is clearer than the 8/80
ratio and its Power Denisty would indicate?

Perhaps PTD and MTD need to be averaged in some way?

My own Pocket Mutation Chess scores poorly on clarity by its PTD of 12/64
(the six starting piece types counted at full value and the 12
promotion/mutation types counted at half value). But its MTD is only 8.5
(FIDE moves plus Nightrider). My own playing experience is that Pocket
Mutation isn't as clear as FIDE, but that the disparity seems less than
PTD would indicate.