The phrase "although not essential" is correct and usable in written English.
It can be used to indicate that something is not necessary but may still be beneficial or relevant in a given context.
Example: "The additional information is helpful, although not essential for understanding the main concept."
Alternatives: "though not necessary" or "even if it's not crucial".
Although not essential, it is desirable that T′dTe = I and that T = T′.
It is customary, although not essential, for a newly appointed first minister to have an audience with the Queen soon after taking office.
In addition, because patents are increasingly international, a knowledge of at least French and German, although not essential, is highly desirable," CIPA continues.
The mean age at onset of headache is 63 years[2].The onset after the age of 50 years is one of the features in the IHS diagnostic criteria of HH (although not essential) [8].
But to be effective in the public discourse of a secular state, its translation into parallel rational propositions which nonetheless share a common ethical end-point is optimal, although not essential.
Although not essential for the polymerization itself the tails seem to stabilize the lateral interaction of vimentin filament subunits.
Although meat is not essential for health, for many it's a key part of any meal.
The surface of many soils in northern areas show distinctive patterns produced by complex processes of freezing and thawing, which cause frost heaving and sorting of debris; although permafrost is not essential to these formations, it is usually present.
She adds that POWRE, although welcome, was not essential to her career.
Although Cd is not essential for plant nutrition, it can be easily taken up from the soil by plant roots and accumulated in different plant organs.
AHP demands that, the problem be structured by the participants in the decision-making process, although it is not essential that all participants in the planning process agree on every component of the problem.
