It’s time to admit quantum theory has reached a dead end

They aren't "utterly incompatible", they're largely compatible. For example, lasers work here on Earth, and between the Earth and its moon. Moreover, hydrogen maser clocks and cesium et al.'s hyperfine transitions are used in clocks which are sensitive to nearby mass concentrations, and altitude above the Earth.

There are whole textbooks written on the limit in which General Relativity and Quantum Mechanics work well together, with Birrell & Davies 1984 https://books.google.co.uk/books?id=SEnaUnrqzrUC being the most widely used by graduate students (and as a reference book for researchers).

Indeed, such textbooks go into where GR & QM make incompatible predictions, and almost all of those are in the limit of strong gravity, which in turn is almost certainly always deep within an event horizon, or isolated in the very very very early universe.

Semi-classical gravity (SCG) works well as an "effective field theory", and simply marries a classical curved spacetime (General-Relativity style) with a relativistic quantum field theory (standard-model-of-particle-physics style). In particular, with minor caveats, on the cusp of strong gravity SCG is successful enough in the astrophysical study of stellar remnants that it is reasonably believed to be good everywhere outside black hole horizons and after the very early universe. https://en.wikipedia.org/wiki/Semiclassical_gravity -- one of the caveats is noted there, namely given a sizeable mass (> kilograms) brought into a superposition of space, it is not clear at all what SCG predicts a cavendish apparatus or other gravimeter will point to. This is a possible incompatibility of SCG's two more-fundamental theories in the weak gravitational field, low-energy matter, and low-speeds-compared-to-c limit, and is a puzzle that hopefully will be informed by clear experimental data some day.

Since we can't get information back from inside a black hole horizon; can't see anything in the very very early universe (electromagnetism hadn't "frozen out" of the GUT yet for instance); direct detectors of very early universe gravitational radiation are implausibly hard engineering tasks; and a bowling ball sized mass will be extremely hard to keep in a coherent state for reasonably long periods of time; these are really academic problems rather than practical ones.

The interpretations don't tell you anything that the calculations didn't tell you already (if an interpretation of quantum mechanics ever predicts something different from what quantum mechanics predicts, then it can be ruled out empirically by performing the appropriate experiment). Interpretations which don't give you a faster way to get to the results of those calculations just waste your time and get in the way of understanding. Theoretical computer science indicates that there is no significantly faster way to get the results of many of those calculations - no matter how elegant the interpretation feels, at best you have to do the same amount of work to get the same answers about what will actually happen in reality, and at worst you end up computing a million irrelevant details about things the interpretation invented which have no real-world consequence.

Someone who is genuinely interested in understanding the way the world works ends up asking questions about what goes into the calculations - what's the Lagrangian, how many degrees of freedom (i.e. quantum fields) are there, what symmetries or constraints are satisfied by the laws of physics, how can we set up the math to avoid pathological situations where the results of our computations are infinite, and so on. Philosophically motivated interpretations of quantum mechanics shed exactly zero light on these questions.

Well.. there is a caveat. If quantum mechanics was somehow incorrect - that is, if unitary evolution of a state vector in a Hilbert space didn't actually describe reality at all - then all of the above would be wrong. But in that case, every single interpretation of quantum mechanics would be wrong as well. Quantum computers would just flat out not work.

Thanks for taking the time to respond. I can see the perspective (at least currently) of “the interpretations don’t add any meaningful information” being the reason not to be interested.