Copenhagen postulates collapse, no? If collapses turn out to happen at problematic times or because of problematic conditions, it could potentially doom quantum computers.

In contrast, many worlds says basically: There is no collapse. Ever.

The fact that no one has found what triggers collapse yet is to me evidence that Copenhagen is false.

Pilot wave theory on the other hand is, afaiu completely equivalent to many worlds, but less philosophically convincing.

Where many worlds says there is only the wave function, pilot wave says there is a wave function but also the material world. And material world is a sort of "view" of the wave function. Continuously rederived from it. But the interesting thing is, this material world has no causal consequences. All causality stems from the wave function and its evolution. This is the compromise to get same predictions as many worlds.

Various interpretation postulate collapses under specific conditions, while other formalisms postulate something mathematically/observationally equivalent at mathematically/observationally equivalent conditions. In particular "problematic collapses" are a thing all quantum computing researchers have to deal with in their work. It is one of the largest subfields of this research program actually (practical quantum error correction).

> The fact that no one has found what triggers collapse yet is to me evidence that Copenhagen is false.

It' just the same as "no one has found what triggers a split between worlds, and why the physical reality we observe is following this particular one of the many worlds".

Well if Occam's razor is not enough, you must know that both many world interpretation of QM and hortodox view of QM are refuted. The one remaining is the statistical one that is: QM is a map not the territory, QM descriptions are description of optimal use of our knowledge (or lack of) on a system. Sufficient knowledge of the environment allow use of classical mechanics. Quantum paradoxes do not exists because e.g the phenomenon such as two simultaneous antithetic state (e.g a cat dead and alive) are just intermediate QM calculations results that have no reality but are useful for calculations. Sadly QM are invaded by BS artists and "philosophers" which prefer fun magic to serious rigorous truths. Source: https://www.google.com/url?sa=t&source=web&rct=j&url=https:/...

It is a travesty to put forward such unfounded claims, and then point to as source a paper by the great Anthony Leggett on the use of condensed matter systems to probe the quantum measurement problem.

What you are claiming is merely the proposition of "hidden variables" aka "local realism", a theory which has been thoroughly rejected by experimental measurements [1,2,3].

[1] https://www.nature.com/articles/nature15759

[2] https://doi.org/10.1103%2FPhysRevLett.115.250401

[3] https://doi.org/10.1103%2FPhysRevLett.115.250402