The reality is that companies at an early stage don't have validation of their idea yet. That is priority #1. The scaling part comes only after you know your idea has merit. It's also "the easy part". With the right allocation of resources and talent, most scaling challenges can be solved. The same cannot be said of creating valuable / interesting products.

The right approach is to optimize for speed and flexibility. Make it as easy as possible to validate your idea. Make it easy to tear down and rebuild in a "scalable" way if you're lucky enough to make it past step #1.