debloat firmware

Hi all, i was working on a guide on the vast amount of packages that we find already installed on EMUI by default and safe to remove because i'm sure that it would be useful for users like me, users that doesn't like to have space occupied on internal storage by bloat software, space that could...

Would anyone know of any method or app that allows you to debloat xperia z Lollipop? Btw, if I'm coming from a rooted 4.4.4 and upgrading it to Lollipop firmware, do I have to root again?