Before you dismiss a beginner's work, remember how much you sucked when you started. You probably sucked worse, actually.
The design is done when the problem goes away.
No is easier to do. Yes is easier to say.
What matters is: Are you profitable? Are you building something great? Are you taking care of your people? Are you treating your customers well?
Projections are just bullshit. They're just guesses.
Customers don't just buy a product - they switch from something else. And customers don't just leave a product - they switch to something else