But isn't the problem that we have pretty-damning-but-still-not-direct evidence for dark matter? If you choose to rather adjust Newtonian physics, we have to g

But isn't the problem that we have pretty-damning-but-still-not-direct evidence for dark matter? If you choose to rather adjust Newtonian physics, we have to go all in and the new problem becomes not only how to "fix" it but also how to explain away the clumping of the Cosmic Microwave Background that is thought to be due to dark matter, the graviational lensing in the Bullet Cluster, the large-scale "web" structure of galaxies in the Universe. Structures and effects that actually fit a dark matter universe pretty well. But yes, maybe there _is_ something else going on, and as a software developer sometimes working on the most terrible things of all: combinations of bugs interacting, and where you keep hunting down a futile rabbit hole assuming a single bug. Maybe this is a combination of bugs in our theories interacting. It could be that this is part flaws in the Newtonian model, part about faults in some other model? That might explain why we've been bashing our heads on the dark matter wall for so long now.