 Although there exist some partial overviews of them, a recent survey is a necessity as the growing number of the methods may cause  uncertainty in practice.
<meaning-changed>  Although there exist some partial overviews of them, a recent survey is a necessity as the growing number of the methods may cause  uncertainty in practice.
 Although there exist some partial overviews of them, a recent survey is a necessity as the growing number of the methods may cause repetitions in methodology and uncertainty in practice.