Even if the guess is reasonable and is eventually true, like "we'll need to scale, so might as well prepare for 100x capacity now", it's still frequently a mistake to over engineer.
The architecture to support something that is not needed tends to introduce rigidity into the codebase, adding a tax to future changes in order to maintain those features.
The architecture to support something that is not needed tends to introduce rigidity into the codebase, adding a tax to future changes in order to maintain those features.