It's a good direction, but sorry I will pass.
Xiaomi phones are full of spyware. How security updates look like? Well... one security update per 9 months that leave you with bugs :/

Xiaomi's approach to security is very very bad. I'm not a super fan of Samsung, but I must say their phones are being patched regularly.

But who concerned in any way with security buys Xiaomi phone in the first place!? :D

Security is not about anitivirus scanning-cleaning-spying tool, its most importantly about security patches which Xiaomi doesn't bring in time -  just whenever they feel the mood to...

I made an obvious typo in the last comment, LOS is AOSP based (not CAF). Very sorry for any confusion :(

Sounds great! However, I pretty much prefer OnePlus approach of community engagement and investement in supporting the *official* LineageOS ROM. Whenever the official LOS sources are made available every other 3rd-party ROM gets a big improvement (i.e., it's a CAF based released with vetted quality standards to become official -- everyone wins from this; except Xiaomi and their MIUI spyware, that is)

Quality of those updates matters.

OS updates : Xiaomi just provides the updates full of bugs and that's it.

Security Updates : expect it to be after half of month or at the last. They have even skipped some months. And keep praying for not introducing any bugs.