re: They should have been called collapsars to begin with
The term "collapsar" could also could be applied to neutron stars, white dwarfs, or other collapsed stellar objects, as any compact remnant of stellar evolution. Pulsars, are neuton stars, after all. Quasars (Quasi-stellar objects) are not stars either, they just look like them on photographic plates. OTOH, some black holes, such as the hypercompact nuclear cores of active galaxies, or potential sub-stellar black holes, are not stars at all.
Perhaps the term "collapsar" should be reserved for just that, collapsed stars.