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What is wrong with PGN (= Portable Game Notation)?

This format contains the name of the variant (or game) in its header tags,
so the exact move syntax could be dependent to the requirements of the game.
For Chess-like games it uses SAN (Standard Algebrac Notation)format to
describe the moves. This is a pretty universal format. (It could also be
used for games like Go, Draughts or Othello, where moves have unambigously
defined side effects, once the move or drop of a single piece is specified.
If a game needs multiple moves per turn, SAN could be extended with a
concatenation operator, say '&', to string together all moves that make
up one turn, and you would already capture an enormously larger number of
games.)

Why re-invent the wheel, if we already have bicycles?