I think that’s probably because NOBODY really understands much, yet.
And every time we reach any sound ‘understanding’ of any little thing, there’s going to be another puzzle before us.
This is the inherent problem with the Great God Science, and especially with the politicization of science.
The notion that anything is ever ‘settled’ is nonsense; and it’s erroneous and insulting toward the values - and history - of science itself.
For example, by the early 20th Century, classical physics worked for almost everything of consequence to traditional life and ordinary perception, but then experiments with radiation showed that the atom was composed of smaller particles. New mysteries appeared, and in a remarkable burst of insight, Einstein explained that light was divisible into color spectra due to the energy of emission of photons as atoms cooled.
After decades of pondering and testing the double-slit experiment, physicists now mostly accept that consciousness is required to explain material phenomena and material existence itself. The implications are recognized in that profession, which now tends to have a relatively high rate of religious belief in comparison to the social sciences.
Indeed, the standard model of physics has been referred to as philosophically a form of panpsychism. And it has been said that physics is now not just an effort to learn God's rules for the Universe, but also a search for proof that God Himself exists. And so I am all for bigger particle accelerators.