Yes, there are lots of benefits. I root my mobile for different purposes but the most common is to be able to delete some system features of xiaomi, like mi coin, mi print, mi cloud.
Eu rom is bloatware free, no Chinese app with Chinese characters..
I use it on my mi 9 pro 5g 12/512 as well.
Yes, everything works on my mobile. Yah, all mi 9 pro 5g have CN rom because there was no global rom released. Hence, limited rom.
You can download it here after you unlock your mobile.
There is no issue since Xiaomi.eu roms are basically the same MIUI (CN) and only added some features and removed the CN bloats and apps.
Been using EU roms for years now. Currently used on Max2, Mi9Pro5G 12/512 and K20ProPremium 12/512.
EDIT: For procedures, make sure to unlock the phone first...
Mi 9 Pro 5G, dirty flash + wipe cache/dalv + root. Seems working as intended and no issue so far.
EDIT: Waaaaaahhh. The new slide animation is not there yet. My K20pro 12/512 has it... I want that. lol