> But SQL schemas often look like this. Columns are nullable by default, and wide tables are common.

Hard disagree. That database table was a waving red flag. I don't know enough/any rust so don't really understand the rest of the article but I have never in my life worked with a database table that had 700 columns. Or even 100.

Yes, you want enough contrast, but not too much. Either extreme is hard to look at for long periods.

> They just hired someone else without an ethical backbone

Or who simply had a different point of view than you.

Dark/charcoal grey is better than pure black for text. But it's still dark enough that most people would call it black.