Yes, indeed and twrp, on my OnePlus3. New installs require complete wiping afaik.

Depends on your device state. If you've unlocked your bootloader already, you should only need to wipe system-level partitions (which would affect applications, but not user storage).

But if you haven't, you need to do that first, which requires you to wipe your entire device, including data.

Just updated on my oneplus3 after reading this!