WWE 2K19 has 100 CAF slots. Hopefully UFC 4 will have the same or more. 20 is really terrible :/
Also, the CAF system on 2K is amazing, in terms of physical customisation. If UFC 4 could match this, or even come close, so that we can create fighters realistically, without using the clunky game face feature, that would be amazing.
And yeah, I hope they keep patching this, even with small changes every now and then, all the way until UFC 4 comes out. Then with UFC 4, just slap us round the face with new modes, greater customization, improved gameplay between striking > clinch > ground