Because it takes time to do that list and its time the devs just do not have access to because they are full on with other things rather than updating a wiki page...
Do you mean this? Concept Stage Bruckell Bruckell Albatross Bruckell Chivala 1969 Bruckell Moonhawk Bruckell Scarborough Bruckell Tiare Charmand Charmand 1304 B Civetta Civetta Fulmine Gavril 1967 Gavril Blackstone 1963 Gavril Bussard 2014 Gavril Roamer Ibishu 2014 Ibishu Covet 1994 Ibishu Pessima Ibishu Hopper Jargl Jargl DT825 Jargl Squit Soliad Soliad Palisade
People probably won't (probably didn't before either. Wasn't there so i don't know) understand the word "concept" and instead will think of the list as an actual list of what vehicles they're gonna make in the future.
