Is it ok to Quick Nav selectively, not universally?

Question

First, to keep us on the same page this is what I mean when I am saying Quick Nav. (Example from Lonely Planet) It is supplementary navigation to inform you what is on the page and send you down to the target content with anchor links.

While I am aware that generally, we want to ensure that we keep experiences consistent across pages; I am designing a site with the intention to keep most pages straight forward and to the point such that they wouldn't require a supplementary quick nav.

However, there are a couple of the overview pages I am considering using a quick nav style to enhance the usability.

So the root of my question is: Is the added utility sufficient motivation to ignore the loss of consistency?

My feeling is that it is ok, but I wanted to hear other's thoughts.

(Again, I know without looking at the wireframes you don't have the proper context to judge this case specifically but am more so asking about the general convention.)

Answer 1

I think I cannot say in more concise way, so it's just a quote and the recommendation to read the whole thing:

The problem with thinking in terms of consistency is that those thoughts focus purely on the design and the user can get lost. “Is what I’m designing consistent with other things we’ve designed (or others have designed)?” is the wrong question to ask.

Instead, the right question is, “Will the user’s current knowledge help them understand how to use what I’m designing?” Current knowledge is the knowledge the user has when they approach the design. It’s the sum of all their previous experiences with relevant products and designs.

Consistency in Design is the Wrong Approach by Jared Spool