Style guides are a notorious time-sink where people will spend enormous amounts of time debating various conventions without that being linked to measurable benefits. One of the big problems here is that people notoriously conflate “familiar” with “better” and you rarely run the counter-experiment showing that after a couple weeks everyone would be familiar with any of the serious proposals.
The advantage of a tool like Black is that it avoids that constant bikeshedding and the fact that it actually does the work for you puts the conversation in a different light because the option which is the least work is just letting Black format the code. Whatever you pick for style, you really want automatic formatting to avoid it seeming like a chore.
