May I humbly recommend Vincent Baker's website, "Anyway" at http://lumpley.com/ ? The conversations there have moved to his private patreon-walled forum (which is worth checking out if you have a few extra bucks) but there's years worth of insight on TTRPG design from an acknowledged master of the art. The newest "article" at the top of the page is an index with highlights from the site's history categorized for rapid access.