In addition to what others have said about testnet transitions already being successful, we already have multiple active PoS networks (Solana, Avalanche, Cosmos

In addition to what others have said about testnet transitions already being successful, we already have multiple active PoS networks (Solana, Avalanche, Cosmos, BSC, etc.) that have been successfully securing billions of value for multiple years. Four or five years ago, it was tenable to say “PoS may just never be successful”, but saying that today ignores literally dozens of real world examples running in production.