You should be giving your client the ADVANTAGES as well as the DISADVANTAGES of using URL RE-write... A professional web builder would do this, not just blindly do what they instructl.
Inform and educate your client, based on sound knowledge and research. Then let them make an informed decision.
As a rule, we ALWAYS strongly advise both new and prospective clients to NOT use URL re-write unless they have very specific plans to render full URL's in their online and / or offline marketing. The search engines use URL's in the BACKGROUND to their outbound links on search results, and if you want to embed the url's into hyperlinks, then the LINK TEXT is what counts... not the shape of the URL to which it points.
The problem you may face is that some plugins do not work well with the re-write systems, and if your client later wishes to add some modifications or custom procedure, the URL re-write can be a big hurdle to overcome. Secondly, once the search engines start to use these re-written URL's in their indexing, it is a MAJOR job to undo this if you later wish to revert to core behaviour. LOTS of redirects needed and you end up forcing the search engines to devote significant time and energy in trying to fathom out just what is pointing to what...
We do not believe that this potential hassle is worth it, and as there is NO BENEFIT to SEO (and your client's SEO person needs to be told this) by rewriting zencart URL's, then there is no business reason for doing so.
However... if your client's site COMPETES with any of ours, then we STRONGLY ADVISE you to add all this junk, because it may cause you some lovely problems - and that means we have one less competitor to worry about!
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