The phrase "become less essential" is correct and usable in written English.
You can use it when referring to something that is needed or important becoming less necessary or important. For example, "As technology advances, manual labor has become less essential."
"Journalists have become less essential and therefore more vulnerable as a result".
It has, to the game's detriment, become less essential through the years.
While there is no gainsaying the insights that come from mastering a language, it will over time become less essential in doing business in Asia, treating patients in Africa or helping resolve conflicts in the Middle East.
Although the reported hours currently spent on chores were not different for fatigued and non-fatigued individuals, every fatigue group (with and without exclusionary conditions) reported spending more time on chores prior to the onset of fatigue, suggesting that chores may become less essential when people become fatigued.
With more aqueduct construction the Central Park reservoirs became less essential, and the lower one, especially, attracted a growing number of replacement proposals: an exhibition hall, a stadium, a parking lot, swimming and wading pools.
The reason for the defect reduction was attributed to efficient nucleation of ALD Al2O3 on ALD W. The effect of the buffer layer becomes less essential as the Al2O3 thickness increases, where the substrate surface physical conditions such as particle contamination become the main cause for defects.
As redrafts focused the play on the two couples, Harbison became less essential, and he was relegated to a small role as the executive officer to the commander of the island, Captain Brackett.
As more individuals in a strain are sequenced, wildtype sequencing becomes less essential.
Furthermore, since we now show that GDP binds the LIC when expressed in human cells, it also becomes less essential to have complete certainty of the bacterially expressed nucleotide.
Once you begin to make headway on self-discovery, the search for a role model becomes less essential to your happiness, as you feel more secure and less lost within your own mind.
When resources are scarce, which essentials become less so?
