I'm sure your team already knows this but you can write in Markdown in Notion. It auto-formats everything. I'm sure it's missing some things and one of them is anything past H3(H4, H5, H6).
It’s more about the affordances. I can’t trust notion not to drop into some command system. Therefore I need to keep my monitor turned on when typing. If I can’t type with the monitor turned off, it must not be a very reliable word processor.