The phrase "are already essential" is correct and usable in written English.
It can be used to indicate that something has become necessary or important at the present time.
Example: "In today's digital age, online security measures are already essential for protecting personal information."
Alternatives: "have become crucial" or "are now vital".
They are already essential to trying to prevent the flow of foreign fighters" and prevent extremists from exporting oil through Turkey.
All of the transformational projects he had to fight so hard for in Germany – extending the Berlin Phil's repertoire in new and older music, establishing its education and outreach work for the first time, opening the ensemble up to new collaborations – are already essential to the LSO's creative core.
GPS systems are already essential for military and air craft operations and it is becoming essential for automobiles that may soon self-drive with data from space.
"It's already essential to so many people but we're forced to feel like criminals," said Bhatt, adding that there should be more publicly funded art spaces.
We hypothesize that the greatest potential for oncologic PET/MRI lies in organ systems for which MRI is already essential today and where CT offers only limited diagnostic value, e.g. brain tumors, gynecologic malignancies, prostate cancer.
The results of a survey conducted on behalf of the JGI at the annual moss meeting 2011 clearly show that for most groups (79%) the initial sequencing and release of the genome was already "essential".
A blood draw is already essential for PSA screening and urine samples are easy to obtain; thus, in conjunction with measuring PSA levels, an additional measurement of plasma, serum, or urinary biomarkers does not place any extra burden on patients.
Volunteers from across the health and social care sectors are already providing essential services.
We cannot transfer our doctors, nurses and assistant medical officers to work at the community level, outside of the health clinics or hospitals since they are already providing essential services to an increasing number of clients accessing our healthcare services.
But many Americans are already being denied essential services every day.
Many volunteers from across the sector are already providing other essential services: from volunteer-delivered "home from hospital" schemes to lunch clubs and shopping services, driving people to GP and hospital visits, or acting as quality assessors for their local Healthwatch.
