“a primary advantage of” is correct and usable in written English.
You can use it when you want to introduce a particular advantage of something. For example, “A primary advantage of using renewable energy sources is that it helps protect the environment.”.
A primary advantage of the proposed model is that projected changes in future rainfall intensities are well preserved.
A primary advantage of functional magnetic resonance imaging (fMRI) over other techniques in neuroscience is its flexibility.
One of the reasons for this is that alloys do not offer substantial weight savings, which is a primary advantage of composites.
A primary advantage of soft robots is that they can be safer than hard, rigid robots not only because they are soft but also because they are often lightweight.
A primary advantage of the new panels over the old is that the initial cost can be offset (by reducing the amount spent on building materials and labour that would normally be used to construct the part of the building that the BIPV modules replace).
A primary advantage of microscopic models was the ability to study individual train motion position and velocity of the trains.
Graesser et al. (1995) argued that the remedial part of tutorial interaction in which tutor and tutee collaboratively improve an initial answer to a problem is the primary advantage of tutoring over classroom instruction.
Now the addition of one new major feature and one cool supported feature to a 37Signals product is a tangible example of the other primary advantage of software as a service – your system got upgraded and you didn't even know it was happening.
The primary advantage of a multiprocessor computer is speed, and thus the ability to manage larger amounts of information.
The primary advantage of a multi-scale approach is that spatial precision and dimensionality (which are generally degraded when data are displayed in 2D at a single scale) can be preserved at all scales.
The primary advantage of a collinear beams geometry is that the effective interaction volume can be made much larger than that obtainable with a crossed beams geometry, which has been used in many earlier photoelectron spectroscopic studies.
