this is a keyword that I would not use as main (so, I would not create a page named "How To Repair a Combi Boiler", but I might insert this keyword into an article that I might have that deals with repairing combi boilers... or even combi boilers in general, it doesn't have to specifically be about repairing combi boilers.
And the reasons for which I'd not use this keyword are:
1) it has ZERO search volume.
I have no problems with 0 SV keywords, and I do target them quite often, but only if they are really easy (when I would rank for them within a few weeks with just 500-600 words of content and no backlinks at all), and / or when they perfectly fit into an article that I'm writing (in this case, an article about repairing combi boilers, or just about combi boilers)
2) even though it has 0 search volume, it's not worthwhile ranking for it because of this:
View attachment 249099
As you can see in the image above the first organic search (if you were to rank #1 for this keyword) is waaaay at the bottom of the page. And you can see the 1st organic result only because I shrunk the screen for the #1 spot to be displayed, otherwise, the SERPs look like this normally:
View attachment 249100
So, why is this keyword bad? Well, the main reason (and I'll stop here) is because any traffic that this keyword - through some miracle - might get, will almost never even see your page, let alone visit it, and it's mainly because of all other things that show up in google before the organic search. The 1st thing your potential visitors will see see is 4 YT videos, followed by 4 PAA questions.
Now, if you were to create a video instead of an article... or if you were to be one of the 4 PAAs that show up below the videos, now that might get you traffic. But where would the traffic come from when this keyword has 0 search volume?
Again, even if it was easy to rank for this keyword, it would still not be worthwhile (at least for me it wouldn't, I obviously can't speak for everyone). But if you absolutely loved this keyword and you absolutely wanted to target it then I would probably slam an AI article as supporting content for an article about combi boilers, and be done with it! I wouldn't even waste a single backlink on this keyword because the 0 SV would not warrant the wasting of the backlink.
Anyway, to answer your questions:
yes, GKP is not very good at detecting easy (or long tail, in general) keywords. Or it might be able to detect it but it will not show them because google doesn't want every Dick and Tom to make money. They want everyone to engage in bid wars for the same ultra tough keywords so that google can make more money off the high bids. So, I'm not surprised that you only find tough keywords
nothing new, just google shitting on the little guys (who usually provide value) even more to make room for the ultra rich and powerful sharks that have billions of $$$ a month to spend on advertising. This particular post by
@SeoBacklinkGenie explains how a small ecom site that was providing value to people just got obliterated so that Amazon can take the #1 spot for keywords they don't even target:
https://www.blackhatworld.com/seo/g...wrong-and-how-to-fix-it.1486129/post-16247285
If you don't have a lot of context on that post to understand it I suggest that you read the entire thread anyway because it's very useful (and it shows what google's latest update did, so you do need to read this if you're serious about SEO)
I noticed. And this is because of what I just explained above, and also because google absolute crushes everyone to make room for the authority sites. If you don't have authority (high DA or DR, like 40+ but preferably 60+) you'll make less and less money. And even high authority is not enough sometimes, you also need to meet google's idiotic EEAT requirements. And sometimes not even that is enough because as soon as you have authority and good EEAT they'll simply wipe you out of the SERPs anyway to force you into buying ads. So, expect to slave your life away for google, or quit SEO altogether
it is worth going for keywords that don't address their intent, just not this particular keyword...
But yeah, it's definitely worth it, if you don't aspire to become the next billionaire you can still afford bread and water with SEO, but you need to find the right keywords