@arubislander
I bought this phone because I'd read about patches for MMS available through the QA Telegram channel. So i originally installed 2.x over Android. I immediately had out-of-space issues when i tried to install the MMS patches. Lionel said in Telegram that they routinely remove unneeded packages in order to make space under 2.x for QA tests.That shouldn't be necessary in order to contribute to QA.
So, there is a known problem with space. My guess is it needs to be expanded. I just saw fredl talk about porting Halium 12 to Pixel 3a and expand the size of root. This looks like a general issue.
There should be a mechanism in the installer or while running UT to free up space. Reinstalling Android and the UT again is a burdensome method. Anyway, that would just get me back to where I started, running 2.x without enough space to do QA.