Regardless if you like it or not, the implementation of the new HUD was NOT handled well...
New HUD is clearly a work in progress, it should not have made its way into live in its current state. There are glaring problems with it. Yes, Riot is coming up with fixes, but these should have been done in PBE. The fact that it was not put in Rank at the same time is an indication that even Riot thinks it's not ready. How long did RIot work on the new SR? Almost all Season 4! Yes, a HUD isn't a big of scale as a whole new map, but considering it's so integral to the game you'd think they would handle it with the same care. The NA CS has to play their playoffs with the new HUD, despite them having to practice in Rank with the old HUD... I could probably keep writing a whole essay here, but I think I said enough.
TL;DR Riot should have worked more on the new HUD, terrible implementation