All experiments agree with the many worlds interpretation (again, better described as a quantum web interpretation), and it is the plain Occam's Razor interpretation.
No additional flourishes needed.
And it is the interpretation that doesn't just conserve in one history (i.e. conservation of energy etc.), but conserves information globally.
That gives the many worlds view very very strong specific theoretical support, that alternate views dispense with.
It is conjectures about elaborations, like "collapses", that would break conservation of information, with no experimental or theoretical necessity underlying them, that would need to prove themselves.
If I lack any optimism, it is for those conjectured complications.
A quantum computer is such a macroscopic state.