The 'immense size' of Berkshire Hathaway, which you raise, is indeed a significant constraint, but the displaced human impact of its acquisition strategy, often focused on mature companies, is rarely considered. These acquisitions, although financially judicious, can lead to layoffs or restructuring, whose costs are not directly reflected in the balance sheets but are borne by individuals and communities.
This external and often invisible cost, related to capital consolidation, alters the dynamics of outperformance.