Way easier than my previous "method". Had no idea about filelist.xml
They're data and Public zips. Settings, apps, etc. Without it you won't get System Update in settings and camera tends to break w/o it. Settings app itself tends to get iffy too if you don't flash it and wipe dalvik/art and cache.
Themes break without it. And you can't set intervalled wallpaper without it. So stuff do break.

The one you have quoted might be for C432B156, but better if you get your own if you need it.
When you update via Funky or Firmware Finder those are downloaded automatically, not sure of they are when you OTA as you can't find them using the OTA links on hwmt.ru.
And they're wiped (/data/hw_init/)when you unlock bootloader (/data wipe) or format Data. So that's why you should flash them after formatting data in twrp