You can blame Sony for that. XD Capcom's X4 almost didn't even make it as a "Game" when Sony released the PSONE, demanding 3D games to show off the hardware. Sony even requested to Capcom to make a 3D megaman, which was how Legends came about. I guess we all know how it went from there...

Oh yeah, they were going to make Megaman Collection on the GBA (Featuring recolored versions of MM1-5 released on the GB) but apparently they "LOST" the original coding. Retarded indeed....