I always played outside tactics, i have 3 good SF's which decided to make them really good on inside skills, but specially wanted to have an outside SF's, some kind of Kevin Durant. Since i realized it's really hard to play an inside zone i changed my training plan and my roster, now i'm playing LI and training diferent. Most of the teams i checked last season season that promoted are playing LI, i don't think this is a random fact.
And it's not just me who try to explain that 2-3 is a weak zone on our community others managers are also complaining there is a lack of inside zones(some of them are playing Div 1) this thread is just an example of many others.
Anyway don't worry you can train-have the team you want. We just ask that if they don't want to fix 2-3 at least give us another zone, maybe it's our problem we don't say it really clear, i don't want a powerfull inside zone, i just want a zone that can work against an inside team, where you can lose/win with it, but with the 2-3 you will lose the 90-95% of the times unless you are much better than your opponent.