Single world decoherence is a single world QM interpretation that avoids all those problems.
Nothing about decoherence necessitates many worlds. Decoherence was introduced as a fix to Everett’s theory , because it isn’t empirically adequate by itself. Preferred basis is another attempted fix.
So there isn’t a single many worlds theory and they all require additional ingredients to work.
Single world decoherence is a single world QM interpretation that avoids all those problems.
Nothing about decoherence necessitates many worlds. Decoherence was introduced as a fix to Everett’s theory , because it isn’t empirically adequate by itself. Preferred basis is another attempted fix.
So there isn’t a single many worlds theory and they all require additional ingredients to work.