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The phrase "are mostly useful" is correct and usable in written English.
It can be used when discussing the general effectiveness or practicality of something, indicating that it is beneficial in most cases but not universally so.
Example: "The tools we have implemented in our workflow are mostly useful for improving productivity, though some may require additional training."
Alternatives: "are generally helpful" or "tend to be beneficial".
Dictionary
are mostly useful
adverb
Mainly or chiefly; for the most part; usually, generally, on the whole.
Exact(11)
Meetings are mostly useful as a barometer of sorts — if people aren't afraid to eat the pastries, it's time to fire a vice president of something or other.
Neil Sheehan, a spokesman for the Nuclear Regulatory Commission, which is supervising the test, said that force-on-force exercises are mostly useful in detecting weaknesses in a plant's response to an attack.
To be sure, he learns to play the piano and picks up fluency in a smattering of foreign languages and high-flown cultural idioms, but these skills are mostly useful in getting women to sleep with him.
However, these metrics are mostly useful for analyzing Xen's scheduler itself.
Such estimates are mostly useful for analyzing impacts in a multivariate system as clearly demonstrated by [19] and [20].
Models based on accurate mathematical expressions for physical processes are mostly useful to understand the actual operation of the plant.
Similar(47)
Having been mostly useful to retailers and manufacturers, it can now help the rest of us shop a little more responsibly.
That was mostly useful as a reminder of her habit of saying things that aren't quite accurate: in September, she told Jimmy Fallon that she'd met Putin as they were both waiting to speak at a conference in Beijing: "We were in sort of a green-room setting, actually".
This optimized pick-l algorithm is mostly useful from a theoretical perspective.
It's mostly useful for greetings, addresses and finishing relatively standard phrases for you.
In their earliest incarnation, Instant Apps were mostly useful for developers of relatively straightforward apps.
More suggestions(17)
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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