Tailwinds and flywheels look superficially similar but are very different.

Both lead to returns greater than the investment; not pushing a rock up a hill but skiing downhill.

Tailwinds are exogenous; they come from outside the thing being accelerated.

Flywheels are endogenous; they come from inside the thing being accelerated.

The conditions outside a thing sometimes change as the context changes.

If you've caught a flywheel, you'll have internal momentum to help you catch your footing in the next context.

But if you've only caught a tailwind, you might be left adrift in the new context.