Yeah I get it, you enjoy fastboot, congrats. When I first installed TWRP, installing it via fastboot was a giant headache ("I had a hell of a time"). I know what I'm doing, and was just curious if anyone had successfully updated their recovery with the TWRP manager app specifically. If you don't know, please refrain from replying again. Trust me, I would much rather flash via fastboot, but my laptop hates flashing recoveries and kernels with fastboot (work laptop, and the only reason I can gather is due to some type of overbearing security feature).