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"in-depth studies" is correct and can be used in written English.
You can use it when you want to indicate that something has been studied thoroughly. For example: "The researchers conducted in-depth studies into various aspects of the subject."
Exact(59)
But in-depth studies have been rare.
Obviously, more in-depth studies on this subject are urgently required.
It was one of the first in-depth studies of contemporary urban life.
And mental-health practitioners embarked on in-depth studies of their patients' idiosyncratic life stories from childhood on.
There are no in-depth studies showing national trends in sexual activity in middle school, ages 10 to 13.
France was one of 12 countries subjected to in-depth studies this year.
But most of its 51 grants -- more than $7 million so far -- have been for in-depth studies at individual campuses, like the one in the Bronx.
In a strictly controlled process, inspection teams would travel the world and deliver in-depth studies that would then inform the voters.
The Foresight Programme from the UK's Government Office for Science produces in-depth studies looking at major issues 20-80 years in the future.
No in-depth studies have been conducted, and no plans for building or improving reservoirs and other infrastructure are even on the drawing board.
It's true that in-depth studies of how to improve education, skills and general employability drop off the thinktank production line almost every month.
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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