I don't think I like the shared paragon feature...to me paragon is also an indicator of how much time and effort I put into that character and that's why I love the no cap feature, but starting a new character that I might delete after 2 hours and have him have the same paragon level as my main is kinda meh.
I get the whole "it will encourage you to start new characters more easily" but honestly I don't think it will, I don't think I know of anyone that wanted to start a new char and didn't because he would need to gain all paragon levels from the start...but that's just me.
Well, I never leveled a wizard for 6+ months because my main was already 100 and I didn't want to spend 0-70 paragon getting nearly no drops So there's me!
I think I get where both of you are coming from. On one hand I love the MF/GF of paragon 100, but I also don't want to make a new character if I've already got 500 Paragon levels with my main(s). The real reason is likely due to the fact that we have no skill trees anymore, nothing to experiment with and see if it would work better than the last time I played that class.