@arubislander if this is too much of a hassle, then do you think I would be able to root other devices with rooted Android?

@arubislander I am planning to buy a Pixel 3a XL because UT apparently rates it as the top functioning device. I haven't bought it yet because, as I have said, I'm trying to cross my t's and dot my i's first before fully jumping into UT.

@arubislander thanks for the info. If you come across any information confirming these possibilities, please share it with me. I would much rather be certain of this first before going full-time to UT.

Edit: typos

@kugiigi that's exactly what I was saying. Unlike what the previous response said, I'm not really interested in connected keyboards not any other peripherals to my phone. I just want to be able to use the phone to root other devices, flash ROMS, basically ADB and Fastboot functionality. Maybe be able to update firmware to my MP3 player (I have a Sandisk Clip Sport). Can you guys confirm that this is possible, or would I need to have rooted Android for something like this? Again, thank you for your responses in advance.

I have been planning to buy a Pixel 3A XL and installing Ubuntu Touch on it to use it as a pocket PC, but I would like to know the limitations of OTG at the moment.
Does it give me USB support like on desktop Ubuntu? Can I connect a tablet through OTG to my phone and flash a ROM to it with Ubuntu Touch?
If this is possible please let me know. It would be easier for me to take a phone with me to be able to root and flash other devices. Thank you in advance!