No, to want the challenge system is to assume that the game will be healthier overall if the players/manager share some of the blame for misuse of VAR, rather than heaping it all on referees and lawmakers. I honestly don't really care how successful the player's challenge % ends up being, that's very much not a factor.
@socal lurker tries to paint some horror scenarios where due to their own actions (using up challenges/failing to have a spare sub), a team doesn't have a challenge available to correct a terrible mistake late in the game. Yes.
That's the point. Again, we only need to look at cricket, tennis, NFL etc - when that happens in those sports, the commentators then look at the earlier occasion where a team wasted a challenge on a low% overturn and blame the player for that earlier poor decision - pressure is immediately removed from the officials, because if the player hadn't gambled earlier on something unlikely or inconsequential, the opportunity to fix a clear mistake would have remained.