Or maybe there's nothing wrong with the equations, they're just the
wrong equations. Or based on a fundamentally wrong assumption.
But this just doesnt look nice to eye and the mind. The laws of nature "must" be shorter, more symmetric. Thats why we invented Superstrings which solves everything, but can never be tested...
my 2 ct
Also, we're nowhere near explaining 99.99999999% of the behaviors we see in the universe. In fact, we're not even able to explain 6% of the things we see in cosmology - as is often explained, dark matter accounts for 27% of all energy in the universe, and dark energy for 68% - and we have no ideas what these actually are, if they exist at all.
my 2 cent
Not to mention, the reason the tension between GR and QM is not very prominent is that we don't know how to conduct "medium scale" experiments, even though the vast majority of physical objects on Earth are in this medium scale: far too big to count particles, too small to measure observe gravitational bending effects. Basically, both QM and GR are completely useless for telling you what happens in compel scenarios like two billiards balls colliding on a frictionless table. They both have equations that are far too complex to actually solve for anything like this. And QM is even worse - even if you could solve the equation, it doesn't tell you what the balls will do, it only tells what chance they have atof being at some position with some velocity and spin if you were to measure that, whatever "measurement" might mean.
Coming at this from philosophy of science rather than as a physicist, I feel those quotes around "must".
I think you also recognise how that might be a sort of "fundamentally wrong assumption".
Imagine your words replayed 50 years in the future, not on physics but applied tp the problem of general AI/sentience.
"The equations that we already have are sufficient to describe human
thought to 99.9999999% but they are a hodge podge of several
different theories...."
"Why on Earth are you looking for a *singular*, unified explanation
of human experience?"
But there's no good reason to assume the system itself just happens to mirror those limits. It would be very strange if the entire universe worked in inconsistent ways that matched the naive reasoning of some not very interesting animals on an ordinary star in the middle of nowhere.