It seems that there is overwhelming experimental evidence that at least some quasars must have significant intrinsic redshifts (as Arp has been suggesting for years). There is also some evidence from a gravitationally lensed quasar suggesting a significant intrinsic magnetic field. These observations are not compatible with the black hole model derived from the standard interpretation of GR. This seems to me to be evidence that the standard interpretation of GR is incorrect. However, it appears that the official line is currently that GR theory is so strong that it cannot be countered by experimental evidence, so there must be some additional effect which is not being taken into account (like dark matter and dark energy). In the case of quasars, it is a statistically unlikely evolution of characteristics with time which just happens to duplicate the weird radial distribution implied by their redshifts. GR just seems to be too tough for Occam's razor! I have seen some fairly convincing papers (by Salvatore Antoci et al) which suggest that even though Einstein's GR and the original Schwarzschild solution are correct, black holes only arise as a result of a mathematical change made by Hilbert. With Schwarzschild's original solution, quasars could be hyper-massive objects with well-defined surfaces and unlimited intrinsic redshift, probably spinning at relativistic speeds, at least when first formed. There would then be little need for any special time evolution of the quasar population, as most of them would fall into the same range of properties. I'm aware that a few quasars have been shown to be at or near their redshift distances by various means. However, according to Arp's plausible observations (ignoring his implausible theories), only the youngest and most active have significant intrinsic redshifts. These appear to decrease with time, and it appears that old quasars probably evolve into galaxies with redshifts approximately corresponding to distance as usual.