Usually developers experiment in Photoshop first and then move it to HTML as coding can be difficult, if one doesn’t know what the end-result would look like. A lot of web companies have used PSD to HTML templates for team workflows. This mainly means that a designer creates a Photoshop mockup and delivers that to a developer who writes all the codes. PSD to HTML are one of the best ways in creating websites.
If, your website looks like a collection of image assets, then the PSD to HTML conversion is a brilliant idea.