On "Ask HN: Hacker News, but for Finance?" (https://news.ycombinator.com/item?id=29557943) https://www.valueinvestorsclub.com/ , https://bogleheads.org/forum/index.php , https://www.elitetrader.com/et/ were suggested.
For the uninitiated bogleheads are followers of the passive investment philosophy of John Bogle (founder of Vanguard) which in short is:
1. Set a standing order from your paycheck to your broker every month
2. Set an automatic buy of a total market ETF and a bond ETF on your broker
3. rebalance once or twice a year
A lot of Reddit seems like that.
Maybe the answer is for each link or topic or submission to have multiple comment pages, and make it significantly more likely for people to find themselves back in old conversations. The way reddit locks discussion after a time frame makes this all but impossible though.
I've learned that maintaining even the simplest "strategy" can be a lot of work.