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I believe generally the motivation in these click-along-lists is to maximize page view counts and ad impression rates, to make top-line numbers look good at the expense of user experience.

I'd suspect if anything bounce or abandonment rates are made worse with these if no other way out is offered. Some will mercifully provide a "show all" link or in this case we have a nice side menu showing the whole list.

In terms of design, I'd say the site looks pleasant but not immediately engaging/interesting/exciting, there's no strong call to do anything. The gray on gray logo text at upper left is weak. I'd think about adding a strong tagline, or something else that sells the product right away, maybe a funny/informative 'top ten reasons cheese is awesome' or 'five reasons you need to know more about cheese' or some such.

Maybe do some re-architecting along with the cleanup.

I didn't walk thru the cart process but the site navigation at least has the look of something that's been patched and altered over time, for example: Main menu My Account and Login point to the same page so that kind of thing should be sorted, the navigation paths should be mapped and made simpler if possible.

The site could do with some copy editing. Might want to tighten up how everything is organized, and plan overall what pages are supposed to be ranking for what terms, the information seems spread around too much, it all seems a little scattered and in places a little verbose.

Here: https://www.ccisolutions.com/StoreFront/category/CLA.cat, we have a mis-used "About Us" page offering additional services descriptions instead of talking exclusively about the company.

Services overviews should be found only on their own focussed pages designed to rank for their terms.

About page should be about the company itself: who's in it, reason for being, history, function within the economy, corporate responsibility ideas, market(s) served. That kind of stuff.

My take just checking quickly.

A guess based on experience but I suspect it depends on the term, with domain working especially well for things like brands and personal names, and being less significant for generic terms.

I see this happening in Canada. Even though in reality your business, like many in Canada, is serving a global market, Google suddenly decides your website is primarily relevant for one of the non-US English speaking markets, and so knocks it back on .com while leaving it alone on .ca (or .uk or ..au.).

My strategy would be to remove as many signals as possible that would make them think you're only serving the UK.

There can be a problem with this approach: hopefully not in your case but there may be a period where the non-.com ranking suffers as a result. I had a situation where I had a clear choice between ranking page 1 on .ca .uk .au while page 10 on .com - or on page 2 for all. Webmaster tools market setting could be flipped back and forth at will to cause either state. The only way out was to set it at page 2 for everywhere and do everything else to get back on 1 - took time and we had to accept the page 2 .ca etc ranking meanwhile.

Yes if it builds community and leads to backlinking.

I'd want to step back a bit and strategize, set some objectives before proceeding. Determine what outcomes are expected, and while you're at it keep in mind how changes could improve user experience.

Maybe end up consolidating if it makes sense as a way to improve rankings, possibly retire some of them by moving the content over to the main site and 301 redirecting everything.

All depends on what we're specifically talking about of course, how well do all the domains rank now (including main), what content is housed where, how does it all inter-relate logically, how much traffic does each currently get, quality of that traffic in conversion terms, consider any trends: are any of them moving up or down lately, what inter-site referral volumes are happening, all that.

To the dup content point: absolutely do not simply copy from one place to another. Hire a writer if necessary to add value by at least offering a different point of view on the material if there is any similar content in more than one place.

You could pick an infrequently-visited page to monitor, maybe even create one just for the purpose, not accessable through normal nav but known to the test visitor, look for a direct visit to the page. Maybe name it so it's at the top of the alphabetical listing of pages in the Content section, something like that.

Do searches like: pages with titles containing "links" or "resources" and niche terms.

I work mostly for companies in Canada, for those targeting only the Canadian market (vs also US or globally) I've found webmaster tools setting for 'target users'  to have the biggest most immediate effect on improving Canadian company search results from within Canada.