The key part of my point was "as long as the designer is aware of the constraints and opportunities of the medium they’re working in."

Designers coming from print often get caught out when designing for the web as they tend to think of a webpage as a fixed layout, rather than a flexible system of components.

It's also important to understand where the design and development budget should be effectively spent. For example, unless there's a real business or usability reason for doing so, there's little point in trying to custom-style form elements like selects as doing so is difficult and time consuming and system defaults look better and provide a more consistent experience.

We demand pixel-perfect accuracy at work between design and code – but the developers must approve the designs first to confirm that it's achievable.

I guess it comes down to what we define as 'pixel perfect'.