So TWRP encryption support and Lineage encryption support are two distinct things. What if you're flashing zips from USB otg on a device with Lineage with encrypted user data, will you still need TWRP encryption support?(ie. will the flash process need to write to the user data partition?)
And also did Lineage support encryption before the last build or did you just mentioned it now because TWRP supports it now?
Offtopic: what do you do with so many different devices(in your signature), do you just use them for development purposes?