Lumpers and splitters are opposing factions in any discipline that has to place individual examples into rigorously defined categories such as in paleontology (fossils) or anthropology (human “fossils”). The lumper-splitter dilemma occurs when there is the need to create classifications and assign examples to them, for example biological taxa and so on. No where is this more apparent then in the fields of fossils but especially in the specific field focused on human evolution (anthropology).
Anthropologists and Paleontologists get fame and funding by “splitting” or finding “new species”. So these fields are filled with splitters.
…studies are showing that interactions between the “new” humans (Modern Humans like you and me) and the “old” humans (Neanderthals, Denisovans, Homo erectus, Homo florensiensis, that are all now extinct) was not just a case of simple replacement. Instead, it appears that groups of new and old humans intermingled, interbred, fought, and interacted in a multitude of different ways which we are still disentangling.https://www.contestedbones.org/copy-of-about-book
“Contested Bones” Jan 2019 Christopher Rupe and Dr. John Sanford