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By non-entry page, I mean it's a page that may be indexed, now or in the future, but it essentially will always be buried in the rankings (unless you searched for the exact page title and first sentence words lol).  In other words, it's not a page I'm trying to get ranked high so realistically its never going to be a page users enter my site through. The consensus seems to confirm my initial gut on this.  With limited time to spend on SEO, you have to prioritize.  Meta description on a "non-entry" page should be very low priority since it's not a ranking factor and the meta description will be rarely seen if ever when the page is going to be on like page 7 of the SERPs for virtually all relevant searches. The only case I can think of for doing this is if you are using Google for your own site search and you do want the page to be properly described in an internal site search result.

Hey There SEOJaz, As you mentioned the word 'optimal' my own description of this would be: A single website representing the brand A store locator linking to an excellent set of landing pages representing the physical locations of the brand. These pages feature unique, compelling content and good CTAs. A submenu or sitemap somewhere on the site linking to these landing pages to sure they are indexable. And that's it. When we start throwing subdomains, 20% different content and micro-sites into the game, what you typically wind up with is confusion, mistakes, content of less than sterling quality and marketing efforts having to be spread too thin across an ecosystem of properties instead of being poured into a single, very strong, branded website. What I've described is optimal, but I'm not sure I've answered your questions...