Very much so still relevant. Even meta-analysis studies of prior research can yield useful data. This is particulary true in clinical medicine and epidemiology where statistical analysis can highlight unseen flaws in clinical practice or established control measures. This brings to mind a study I read about the treatment of head injuries with steroids, which is/was standard practice, the statistical analysis of which showed that this treatment was associated with a significant increase in risk of subsequent death (I apologise for mentioning studies I do not have a link/reference for, but it should be possible to track down via Pubmed)