We're at the point now where I can reasonably keep large numbers of video/text recorded from OBS in S3, run my own speech-to-text, I can cram it all into a SQLite DB, wrap it in a web front-end and then serve it all from cloudfront or wherever.
There is obviously benefit in organizing thoughts using essays as a tool, but if you just want a record of your quick thoughts I almost think screen-capture + webcam + spoken word might be a decent option. Literally use OBS to record your 1-hour (or 4 hours) per day HN habit and keep it for prosperity.