But there have been self-inflicted issues. The seemingly unconditional refusal to explore technology companies. (While his Apple investment was great, even Buffett would tell you this is a consumer company and not a tech company) The allowing of the two new managers to keep breaking Berkshire's rules, such as not investing in IPO's, or not investing in airlines. The large write down in PCP. The double-speak about "never bet against America" while remaining paralyzed during the COVID panic. Maybe these things are moot compared to the scale problem.
But I think the more disheartening issue is Buffett's last 5-6 letters have been forgettable, and today's was really just a recap of Berkshire's main assets, not offering anything particularly insightful or interesting. I think he's still doing an admirable job but Berkshire just isn't what it used to be. Everything has a cycle.