Hey There, Green Web!
Thanks for reading my article. It's a bit of an old one, but in the main, is still pretty accurate advice. This one is 2 years fresher, in case it helps: https://moz.com/blog/overcoming-your-fear-of-local-landing-pages
All that being said, there are horses for courses, and a blog post like the one you've linked to is offering general best practices rather than one-on-one consulting about what you, personally, should do for your specific business model. You're totally right that that post (though long!) didn't cover every possible scenario.
From your description, it sounds like you have a service area business that serves within a tight radius (as opposed to having a restaurant chain with 30 locations across the state of California). Please, correct me on anything I'm not quite getting right about your model. If you have a single physical location, you are only able to create a single Google My Business listing and citation set for your business. This often frustrates SABs, because they may serve multiple cities from a single location, and can't rank in the local packs for them, because Google will only rank their physical location within a single town. So, a plumber in Oakland might be annoyed that he can't also rank for San Jose and San Francisco, because he lacks physical locations there.
It's from this dilemma, and from the desire to target content to specific user groups that the practice of creating local landing pages evolved. If you can't rank in the local packs for your service cities, you can go after organic rankings with landing pages. If you don't do anything, you have little or no chance of ever seeing rankings of any kind for these service cities.
Beverly Hills is considered a separate city from Los Angeles, as is another city like West Hollywood. These are not merely neighborhoods of Los Angeles, but actually considered separate cities. If you do a search for "plumber Los Angeles" you will get completely different local and organic results than for a search for "plumber Beverly Hills". So, clearly, Google sees these as totally distinct user bases, and if a searcher located in Beverly Hills or Los Angeles just searches for "plumber", they are going to see these totally different results, localized to their location at the time they search.
Because of this, it's not really safe to go with your assumption that people know a plumber in LA serves Beverly Hills, despite the short driving distance between them. Whether this is good common sense or not, it's not the way Google works, and relying on Google to show your LA-based plumbing company to Beverly Hills searchers will not work unless you give Google some additional reason to do so (that being content on your website showcasing your services in Beverly Hills, which may give you some hope of ranking organically for these searches).
Upshot: If you need customers from Beverly Hills to find you on the web, you must build something for them to find. Your options for this would include:
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A Beverly Hills landing page
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Ongoing blogging showcasing your work in Beverly Hills
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Paid advertising targeted to Beverly Hills
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Social media outreach targeting Beverly Hills
In a competitive market, you'll likely need to do all of this to build brand awareness in any city where you serve but aren't physically located.
I completely get your UX concerns. You are rightly perceiving that there's a real danger of putting up a bunch of weak, silly content for every city your company serves, and that this would downgrade user experience and the overall quality of your website. So, you can't take that route. Rather, you'd want to come up with a plan for making those landing pages incredibly useful and persuasive, so that they truly do serve users, while also signalling to search engines that you have relevance to this target community. Hopefully, that newer article I've linked to will provide some inspiration, but if you need further ideas, please feel free to ask here.