Ask the not-race car builder is they think the article mix is "fair."
The motorcycle builders.
The not-military plane builders.
Or the "real" space modelers.
And, heaven forfend you ask the commercial ship builders (o_O)
Each of those genres are hugely under-represented in kits out there. Even including exotic media versions. Browse through the different sections here. There are no end of "I want to build a [thing] at [scale], is ther eone made?" threads. When the answer is not a categorical "no," it's often a "yes" but in a limited run cottage/garage molded kit in a weird material for an arm and two legs (if even in production at all).
Let's suppose you wanted to model a US 7.5ton atriller prime mover truck (the correct vehicl to tow a 155mm Long Tom). Not only are the review few and far between, the one and only kit (IIRC) was a limited release kit that was like £150.
Want to build APA and/or AKA in 1/350? Pretty much sol unless you are willing to engage in a lot of plastic surgery; an Anchorage LSD? scratchbuild.
There's really a lot of gundam review--if you can read Japanese.
Published media generally reflects market interest/participation for the area a periodical serves.
I remember reading all the complaints about how RCM (Radio Control Modeler) "failed" to include enough content on RC ships & boats.
What gets glossed over here is that producing articles for publication requires work. A commitment to the craft of writing, and specifically for writing for periodical publication. I really have to push myself to pound out articles for architectural publications--and that's a field I've been practicing in for forty years. If an editor came to me ans said we need more articles on golf course design, well, what I know about golf course design would barely fill five paragraphs.
See above: Want to see more reiews, submit more reiews for publication. (Protip: Start small, start with a blog, the learning curve hurts a little less.)