Did some math.

Wilder's opponents' combined records:

426 Wins - 196 Losses - 19 Draws.

Percentage-wise:
66.46 % Wins.
30.58 % Losses.
2.96 % Draws.

Over 5 years as a pro, this 28 year old undefeated fighter still has fought no one of consequence yet regarding World Class Boxing. He should've been in there with some Top 10 guys by now, someone that really gonna be fighting back.
A fighter doesn't develop nor learn anything unless his management steps up the competition each time out. Are they scared to put him in there with a live one?
It's over-protecting, and stagnating this fighter's development.