yeah, cause it's more less known what happens before cv3 (drac lives more less peacefully with lisa, then village people kill her, he goes RAAAAAGEEEE and starts a war against humanity, church sends troops+sypha etc) but it's still not known what was going on during the 300 year period after loi.
that said I really hope they will not touch the 1900s anymore. it already has 3 games in it (with the 3rd one, the 1999 conflict estabilished though not made yet, but most likely it will be in the future) and we don't need more than that. i mean, one of iga's reasons for retconning cv64/lod was that the 1800s were too crowded, with only 4 games
though maybe he would retcon pork if he were to make another game in 1900s lol