I think Denis addressed this in his post: "Overall, as an engineer, you will never regret taking part in the development of a sharding solution. It’s a complex engineering problem with many non-trivial tasks to solve". In other words, it might be not invented here syndrome (with all due respect to Figma team). Or there might be more nuances we are unaware about.
pas|1 year ago
also, it's... strange that they had 18 months and "extremely tight timeline pressure" we simply don't know enough about the situation