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The honest answer is that cloud doesn’t make most things cheaper or faster by default. It makes them more elastic and more automatable. Whether that turns into cost savings depends on how you operate.
The teams that win on cloud treat it like a product, not an outsourced data center. They invest in IaC, observability, and FinOps from day one. The teams that lose treat the bill as a fixed cost and only look up when it doubles.
Migration is the riskiest moment. We strongly prefer the strangler-fig: move the riskiest workloads first, keep the legacy alive until the new system is proven, and only then sunset.