Non-binary, agender, third gender, two spirit and other genders still exist. Some people also do wish to still acknowledge their transition as well. Some trans people do not use trans to describe themselves post-transition, but some do. It's really down to each individual. The term still gets used though because there are some issues in healthcare, the justice system, social work, etc. that still will only affect transgender people and won't affect cisgender people. So we need a way to talk about those issues without confusion, thus the distinction is still made even for binary trans people sometimes.