Thank you brother! I cannot see twrp for odin on their official website, maybe jjhitel and panda is a fork of the official twrp. Will do my assignment and search for the difference of the two twrp fork.1. Convinience, and OTA update, if the specific TWRP supports it.
2. TWRP is the recovery, twrp.me is the official website for TWRP releases.
3. Wrong question. The question should be: "Is there a TWRP for MIX 4?". TWRP is not a Play Store app, it's a recovery partition that has to be built for each device individually.
There are TWRP releases for MIX 4, and you mentioned both in question 4.
4. No idea, not the place to ask that as we're not involved in any TWRP development.
5. MIX 4 is in the table.
Learning a lot on Xiaomi devices reading posts from this forum. Thanks a lot fam!