How could they have possibly done high-definition data for thousands of teams in time for release? They're not prepared to make teams with generic faces and kits; they want everything to look perfect. Do you blame them? Look at the people in this thread going "it's crap that the unlicensed teams will look so basic". If they did 50 teams like that, people would be fuming, so it's better to hold back on them and save themselves the death threats.
It's the same reason the lower-league teams are missing from FIFA on next-gen, it would take them a fucking AGE to do the amount of research to get the body types right, to create all of the high-definition faces (that's a 3D model AND a skin) and to create all of the high-definition kits as well.
It takes an age to do a model of a face. If they had to do that 22 times over for 50 teams (that the majority of players won't be too worried about), then that would mean a thousand faces would have to be made, and it would take a year to do that. If they included an extra 100 teams, it would be two thousand faces, which would take even longer. So far, we're nowhere near a thousand teams, and there's two thousand faces to make, EXCLUDING the kits they would have to make and the research they would have to undertake. You're expecting way too much.