[MiroF]

> representing all the slicing, column removal, joins, etc. is actually pretty hard without dependent tricks

Disagree in the strongest possible terms, tbh.

It's the lack of static typing that gets you 3/4 of the way down your experimental pipeline only for your code to fail because column "trianing_batch" can't be found. Huge productivity loss, even with rapid iteration.

[mumblemumble]

We must work very differently. I couldn't fathom that happening to me, if only because I compulsively peek at samples of the data frame every step of the way, in order to make sure the data look reasonable all the way through.