Brožová et al. (2022) present a study, “Toward finally unraveling the phylogenetic relationships of Juncaceae with respect to another cyperid family, Cyperaceae”, with the premise of revising the phylogenetic relationships in Juncaceae and Cyperaceae based on Sanger sequencing of one nuclear rDNA (ITS) and two plastid regions (the gene rbcL and the spacer trnL-F). While the paper highlights the need for ongoing taxonomic revision in Juncaceae, we are concerned that their analyses and conclusions could lead to nomenclatural instability and unnecessary confusion among researchers, particularly those working in cyperids (Cyperaceae, Juncaceae and Thurniaceae) and closely allied monocot lineages. Our concerns stem from the use of incomplete datasets and the failure to integrate recently published taxonomic literature. As a result, the systematic conclusions drawn by the authors are outdated and conflict with previous studies based on more complete phylogenomic datasets (e.g., Larridon et al., 2021), leading to unjustifiable (i.e., proposed recognition of non-monophyletic genera) and superfluous (i.e., already completed nomenclatural changes) recommendations.