Geology is a great choice. I sometimes think the best subjects to study are the ones that have nothing to do with your job, but they're also the hardest to justify when your brain is already tired from work
It feels like the real reason many people go back to school: not some grand career optimization plan, but being bored, stuck and wanting life to move again
I can understand not wanting to kill someone's CI in the middle of active development, but then the product needs a very explicit consent step before converting free minutes into deb