Should I be worried about the orphaned pages?

Selected answers from the Dumb SEO Questions Facebook & G+ community.

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  Ammon Johns: Okay, so this is a complex one. You may need to break this down into several different discussions to make it easier to differentiate which things apply to which parts.
  
  It seems like the site is absolutely reliant on JavaScript for functionality, other than through a sitemap ... is that correct? This in itself is an accessibility issue, because for security some users disable the running of JavaScript on sites they have not trusted or whitelisted.
  
  Furthermore, not all users of the web use common browsers. Some of the special browsers for blind users, for instance, don`t process JavaScript. Some phones don`t process all JavaScript. And most search spiders do NOT process JavaScript - even Google just pass everything to a separate rendering process that runs at a later time.
  
  Since the site seems to break completely without JavaScript, this would be classed as a fail in accessibility testing.
  
  Here`s what your Dog Treat category looks like with JavaScript turned off in Chrome (a not completely uncommon security move since it blocks most popups and spam to disable JavaScript and any site *should* run without it, even if with more limited functionality.
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  Chris Boggs: agree with Ammon`s prioritization as the "first thing" that would need to be fixed to be better for SEO.
  
  A side note is your site: reveals some lorem ipsum pages that are indexed. Maybe these pages which load blank (example https://www.wildwestpet.co.uk/.../natural-instinct-tripe...) are also causing Google to give up trying to find "good ones" ... often they can find a way around this type or orphaning (with pages that have other ecommerce system-delivered products)
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  Chris Boggs: additonally, when I tried to click to your page from my comment, it attached an fbclid which seems to also break things. https://www.wildwestpet.co.uk/.../natural-instinct-tripe...
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  Ethan Lazuk: Others have raised good points here. There are a lot of good resources on JavaScript and SEO best practices. I’d recommend talking with your developer. Sometimes SEO tools aren’t as sophisticated as Googlebot. Besides url inspection, the Mobile Friendliness Tool would be good here to get a sense of what links/resources Googlebot sees. Regarding indexed pages, I’d check that your title tags and meta descriptions are unique for each page and that the only pages in your xml sitemap are ones meant to be indexed. The site:search won’t show all your indexed pages necessarily. Also pages may not show up in search right away after submission. In my experience it might take longer for new or less authoritative sites. Maybe a few days or more? To see what’s indexed, check index coverage report in Search Console once data populates. Look at performance to see if pages get impressions, and for what. Might also check the links section there. It also wouldn’t hurt to write a few awesome blog posts and link internally for good measure. Here’s a good place to start for JavaScript: https://developers.google.com/.../javascript-seo-basics. Best of luck on the business!
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  Nick Dawes: Ethan Lazuk great article, clears up a few questions I had 👍
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  Nick Dawes: Thanks for the helpful comments so far guys, really appreciate it.
  
  I have a confession; I’m the developer in this case, really only just getting my feet wet with regards to SEO! Most applications I’ve built previously have been in-house tools for various companies, where accessibility and SEO haven’t had much focus. Which is why I’d like to improve.
  
  Thanks for the article Ethan Lazuk, I’ll read it now 👍