I'm a big fan of long-form strategy thought pieces. Writing out complex and hard-to-argue-for positions brings out a type of nuanced information exchange that in-person discussions rarely offers. You get to argue wholly, before someone cuts you off (I'm guilty of this). Plus, the loudest person in the room doesn't get to dominate the conversation.

I have tried to compile some of my favorite internal memos ones in this page.

ps: wow I've just discovered my thought-twin in this area: https://sriramk.com/memos