Myself, I’m not sure how much I care. If a website fails to do do what it sets out to do, that, I care about. Design is failing there. But if a website has a design that is a bit boring, but does just what everyone needs it to do, that’s just fine. All hail boring. Although I admit it’s particularly ironic when a design agency’s own site feels regurgitated.
My emotional state is likely more intrigued about your business model and envious of your success than eyerolly about your design.
As long as I’m playing armchair devil’s advocate, if every website was a complete and total design departure from the next, I imagine that would be worse. To have to-relearn how each new site works means not taking advantages of affordances, which make people productive out of the gate with new experiences.
I’ve certainly leaned on templates and frameworks for web design in the past. (I haven’t even created a unique WordPress template for this site.) And I certainly feel where the author is coming from. Yes, any designer wants to put their own unique stamp on a client’s site or other project, but that should not get in the way of the site’s usefulness.
If your site is useful, clean, and easy to navigate, then I can forgive it having a similar look-and-feel to other sites.