If any theory can be adjusted to explain anything, then is that ADJUSTED theory still more simple than the other competing theories? Simplicity on its own isn't important, it needs to also explain. The simplest theory of physics which doesn't explain the stuff we see doesn't matter - and if you say "well it can be adjusted to explain whatever", then okay, how simple does it look after adjustment? If the adjusted theory explains stuff, and not the original theory, then we care about the adjusted one and the simplicity of it.
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