@Leucrotta Maybe any of the above depending on TTRPG and content format?
I've always felt both daunted and frustrated by the volume of content available for any TTRPG's of interest. Supplements often feel like extended thematic magazines. As sourcebook and supplement content mushrooms, there is too much page-flipping or memorizing, not enough quick reference cards or sheets.
RPG box sets and campaign packs are probably closest to what I most enjoy out of the hobby board game experience.