Features are either valuable or waste and when the company, product or service grows and attracts more customers you’ll be faced with more feature request. To keep your product simple and easy to use these requests can be not in your best interest.
Do not reject all of them
It is not because you’re resilient that you should never accept feature requests. Track these metrics and when a variations of the same feature request keeps popping up over and over again, it’s a good indicator that this might be a valuable feature
Employees
When the startup has actual employees besides the founders, these too can request and recommend features. Treat these requests with the same scrutiny as from customers.
Reference
Fried, Jason, and David Heinemeier Hansson. Rework. 1st ed, Crown Business, 2010.
Highlights or timestamps
Never overreact to these requests by immediately modifying your product and adding new features as requested. If you do, your product will rapidly become unrecognizable, and probably scare away new customers since the changes have been catered to the wishes of existing ones.
— ^82c70d from Rework