I've been using Cloudflare and have found the opposite.

You can accomplish an incredible amount for a small business with Pages and a single monolithic function. Once you outgrow that, IMHO, it's time to consider moving to a server - not to a more "complete" serverless offering like lambda.

The migration path for this is pretty staightforward since the API surface area of a cloudflare worker is pretty small (depending on whether, and how, you are using Durable Objects, KV, D1, R2, etc. things can get a little harder). I can usually port a cloudflare worker to a Node.js service in < a day of work.