why pgn4 in variants

Wondering why chess variants like "checkers" and "blindfold" don't use standard pgn notation. Aside from the look of the pieces (or lack thereof) there shouldn't be a difference in notation. I'd like to analyze these games but the pgn text isn't accepted. Following is an example

[GameNr "64932712"]
[TimeControl "3+2"]
[Variant "FFA"]
[RuleVariants "EnPassant CheckyChess Play4Mate"]
[StartFen4 "2PC"]
[White "KingCatChess"]
[WhiteElo "1925"]
[Black "ACZ11173934"]
[BlackElo "1478"]
[Result "1-0"]
[Termination "Black resigned • 1-0"]
[Site "www.chess.com/variants/chess-with-checkers/game/64932712"]
[Date "Sun Apr 28 2024 01:02:11 GMT+0000 (Coordinated Universal Time)"]
[CurrentMove "98"]

1. h5-h7 .. g10-g8
2. h7xg8 .. Qg11xg8
3. Ne4-f6 .. Qg8-d8
4. g5-g7 .. Nj11-i9
5. Nj4-i6 .. Bf11-i8
6. Bf4-g5 .. h10-h9
7. Bi4-g6 .. Bi8-j9
8. Nf6-h7 .. Qd8-e9
9. Nh7xNi9+ .. j10xNi9
10. O-O .. Ne11-f9
11. Bg6xBj9 .. k10xBj9
12. Bg5-h6 .. O-O-O
13. g7-g8 .. Rg11xg8
14. Bh6xQe9 .. Rg8xQg4
15. Rd4xRg4 .. d10xBe9
16. f5-f6 .. Bi11-g9
17. k5-k6 .. Nf9-h8
18. Ni6-g5 .. Nh8-g6
19. Ng5-h7 .. Ng6xe5
20. Rg4-e4 .. Ne5-f7
21. Nh7xi9 .. Nf7-g5
22. Ri4-g4 .. Ng5xRe4
23. Rg4xNe4 .. Rk11-k7
24. i5-i6 .. Rk7-i7
25. Ni9-h7 .. Ri7-i8
26. Nh7xBg9+ .. f10xNg9
27. Re4xe9 .. Kf11-f10
28. Re9-e7 .. Ri8-g8
29. d5-d7 .. Rg8-g4+
30. Kj4-i5 .. Rg4-g5+
31. Ki5-j6 .. Rg5-g6
32. Re7-f7+ .. Kf10-g10
33. Kj6-i7 .. h9-h8+
34. Ki7-h7 .. Rg6-g4
35. Rf7-e7 .. Rg4-h4+
36. Kh7-g6 .. Kg10-h9
37. Re7xe10 .. Rh4-g4+
38. Kg6-h5 .. Rg4-g8
39. Re10-e8 .. Rg8xRe8
40. d7xRe8 .. Kh9-g10
41. f6-f7 .. Kg10-f10
42. Kh5-g6 .. Kf10-e9
43. Kg6-h7 .. Ke9-f8
44. i6-i7 .. h8xi7
45. Kh7xi7 .. Kf8xf7
46. e8-e9 .. g9-g8
47. e9-e10 .. g8-g7
48. e10-e11=Q .. g7-g6
49. Qe11-f11+ .. R

The variants server has a PGN output that is the same for all variants instead of having different code for variants that could potentially support a standard PGN.