The phrase "a simplistic approach to" is correct and usable in written English.
It can be used when discussing a method or strategy that is overly simple or lacks depth in addressing a particular issue or topic.
Example: "While the report offers a simplistic approach to solving the problem, it fails to consider the complexities involved."
Alternatives: "a naive method for" or "a reductionist view of".
A simplistic approach to goal setting.
The Lib Dems think that many Tories take a simplistic approach to the Middle East.
Such a simplistic approach to selling to young working people, Ms. Versacio said, "is a little bit of an insult".
In this review, a simplistic approach to the diagnosis of well differentiated thyroid neoplasia is provided to challenge the dogma.
To be more motivating, avoid these four traps: a simplistic approach to goal setting, biased evaluations of performance, the boring nature of work, and useless feedback.
However, this initial predilection to deal with Russia should not be mistaken for a simplistic approach to freely give Moscow that which it desires.
The diversity of the movements and the complexity of our societies would make any simplistic approach to be futile.
They range from an unduly simplistic approach to cementing a well that penetrated a complex geologic structure to not installing additional hardware that would have helped back up the cement barrier.
Models and software for dealing with covariate non-response within a longitudinal mixture model setting are still in their infancy and previous work within the substance use literature has often adopted a relatively simplistic approach to these issues such as the use of a single imputed data set (Li et al., 2001; Hix-Small et al., 2004).
An opponent of gun control, Mr. Ruger argued in a 1981 interview with The New York Times that restricting gun access was "a crudely simplistic approach" to crime.
I think that this article takes a very simplistic approach to things.
