I'll just say one more thing for you to consider - not entirely different than I've said before, but a little different approach.
Consider that there is a point of diminishing returns .... that more of something isn't always better, especially if it takes away from something else.
POINT A: Running 24+ times a game Zeke can absolutely dominate a game. The more you take away from that, the less ability he will have to dominate games.
POINT B: Let's say Antonio Brown, who is either the best or at least one of the best WR's in football, is also very good at running reverses (he is), so, the Steelers decide to start running reverses 7-8 times a game instead of 1-2 times a game, and naturally the opposing defense begins to recognize it more quickly, and in subsequent games the opposing defense actually game plans for it. No more element of surprise, no more running a play the opposing defense hasn't game planned for ..... and now the results on each end around aren't so good anymore, and in fact, the defense starts to meet the receiver in the backfield before he ever gets a chance to get to the outside. Then there's the issue of Antonio Brown being gassed on plays they might need him as a receiver, or possibly getting hurt, or just losing some focus on what his primary talent is - which is getting open and catching passes.
Same applies to an elite RB catching passes. With a moderate number of catches, each reception is very productive because it is a supplement to the RB's efforts, rather than the focus of it. But if used to often teams come to recognize what the Cowboys are doing, and game plan for it, the opportunity for big plays will diminish, and the possibility the opposing defense will recognize it and make a big play of their own is increased. Again - a point of diminishing returns.
And like with the Antonio Brown example, the guy needed to carry the running game for the team will sometimes be gassed, and he may have more difficulty getting into the flow of the running game, which is important as most runners will tell you the more they run the ball and see the blocking and defense the better feel they have for what they need to do. The result is you will have turned Zeke into a jack of all trades, master of none. He currently is a master as a ball carrier.