[7Figures2Commas]

> "Let’s try it in green" or "Can we use a slider instead" are potentially hazardous forms of feedback considering marketable solutions don't come from the UI. This causes the designer to shuffle through hundreds of UI elements and burn valuable time.

> A designer is paid ~$110k/y on average in San Francisco. Scratch figure of $43/hr. A great designer can change the UI elements on a Photoshop document in about an hour. You have a one-hour meeting to provide feedback. Three days to produce changes. Multiply that by how many team members involved in the meeting, plus the daily burn of the Company. For a cost- effective average startup, that's around $4,309.00 every time you provide feedback.

This math doesn't add up. I don't know what companies the OP is basing his assumptions on, but a "cost-effective average startup" doesn't spend $4,000 every time a designer is asked to change a color or form element.

There are some good points in this post but hyperbolic warnings like this take away from them.