The problem with this development standard is that you really can't prove it one way or another, and it's probably different for different players. You can craft any narrative you want about what led to more development, but at the end of the day you can't prove what caused what. You could say the benching is exactly what made Brice play better, or you could say Brice was already this good and he would have gotten here anyways with more playing time. Personally, I don't even think Brice was playing that bad to begin with. We didn't bench Ace who was playing worse and Ace got better. There's just no way of knowing what would have happened if the alternative was true.
Wrt Svi getting minutes is that I never for once cared that he didn't get minutes prior and I don't see a reason why I should suddenly switch my tone on that. If you think Hardy is doing a good thing this year for development, you must also say that he did a bad thing last year for development whenever he just let the guys play. You can decide for yourself which method is better, and it's not entirely black/white, but you just can't have it both ways. Generally, I don't think our players need more discipline and motivation. I think they need more reps and opportunities to learn the game and being allowed to play through mistakes has led to good development.
And of course, there are other incentives beyond development as to why you play some players and not others. think you're being obtuse if you think this is entirely about development....I do think he simply just wants to win the game.
You also cannot deny his history of having clear favorites and it's history that does not indicate a preference for what people seem to be saying it does. I cannot look at his preference for Clarkson, for example, and say with a straight face that Hardy is all about playing the right way.