False, firmware spoofer allows you to play games higher then 4.5. Also to the OP, nothing is wrong with emunand 7.2 except broken eshop. If you just plan to play games then go ahead and update. If you plan to play online, some games (pokemon, mario kart 7, etc) require updates to play online that you cant get until gateway gets past the new 7.2 encryption so you would be out of luck until then.
So let's use Pokemon as an example. Can that run on 4.5? Or would it need to be emuNAND'd?
'Cause from what you're replying to, it seems as though emunand isn't needed at all to play newer games, eh? Sorry, just a bit new to emunand-talk, if you haven't noticed already, haha!