"narrow applications" is a correct and usable phrase in written English.
It can be used to describe a specific, limited use or function of something. Example: The new software has narrow applications, as it is only designed for use in accounting and financial management.
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These skills have narrow applications, but, then, so does C.P.R. Their goal is to avert the interminable lines and vanished hours that seem, at times, maybe a little worse than death.
Based on this review, our recommendation for researchers in the area of AR technology is that the current trial systems should have narrow applications and there is an essential need for more comprehensive systems.
These next-generation lights now serve such narrow applications as retail displays, but next year, Mueller says, Color Kinetics will use LEDs to produce new white lightbulbs that consume only half as much electricity as ordinary bulbs and last ten years or more.
Artificial Intelligence (which I'll refer to hereafter by its nickname, "AI") is the subfield of Computer Science devoted to developing programs that enable computers to display behavior that can (broadly) be characterized as intelligent.[1] Most research in AI is devoted to fairly narrow applications, such as planning or speech-to-speech translation in limited, well defined task domains.
These next-generation lights now serve narrow applications such as retail displays, but next year, Mueller says, Color Kinetics will use LEDs to produce super new white lightbulbs that consume half as much electricity as ordinary bulbs and last ten years or more.
Although one LMI-based sufficient condition ensuring the exponential stability for equation (2) has been obtained in [16], this condition is more conservative since the mode-transformation technique and the bounding technique are both used, and the obtained result has narrow applications since the condition | p | + | b | < 1, (11).
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That improves incentives, which is a good idea, but it has a narrow application.
Outside the courthouse, the foreman, Mr. Zaccar, criticized what he called the overly narrow application of the law.
"What it means is that Central Bank is going to receive a narrow application going forward, and not an expansive one".
Oedipus, again, is a political leader who mistakenly believes that justice can be attained and suffering relieved by the narrow application of reason and will alone.
Karen Petrou of Federal Financial Analytics in Washington fears that the American regulators' narrow application will allow some quite big American banks to side-step realistic capital charges, by using the old Basel 1 loopholes.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com