I know this may go against the ethos of some folks on HN, but I switched to Apple Notes and haven't looked back. At the end of the day, you either use the tool

I know this may go against the ethos of some folks on HN, but I switched to Apple Notes and haven't looked back. At the end of the day, you either use the tool or the tool uses you. For diagrams, mindmaps, etc... I just use Freeform now -- screen capture or export the board as PDF to paste into my notes. It's deceptively flexible and more powerful than it would appear.