I remember of reading abt non requirement of financial docs for DV selectee on the 39th page of the 42 page long I-485 instruction, and that was were i was confused since i noted almost every applicant have mentioned about the submission of some sort of fin docs, but it's technically not required, so i was confused as to include it or not for my i-485 package.
Additional posts worth reading:
Interview Letter with I-134 requirement
I-134 Requested during interview
Financial documents requested during interview
These are just a few examples of the need to be fully prepared - these folks wouldn’t have been approved if they didn’t attend their interviews prepared with evidence to convince their IOs they’re unlikely to become a public charge. The need to present financial documents may not be technically required on the basis of it not be expressly listed on the I-485 instructions, however the expectation is still there for a petitioner to be able to demonstrate they’re unlikely to become a public charge.