The last time i checked it needed gadget kernel driver support and root, a showstopper for me...
Apart from that, great concept: load your 5+ cd images onto your 64+ gb android and be done (win10, ubuntu, debian, grml, kali, bios update cd image, etc) and forget about your usb drive collection...
I thought modern android required the gadget driver anyway? I’m pretty I was able to use it without root but it was (supposedly) less reliable without it.
Once I didn't have any USB sticks handy and didn't know about DriveDroid, so I used Servers Ultimate to host a TFTP server so I could PXE boot the netboot.xzy image from my phone to my laptop then download+install Arch Linux.