Too much digital ink has already been spilled over this word "obvious"

Probably because there is no precise definition of "obvious"? Does it mean "trivial", as in "its proof requires the skills much lower than those expected from the audience"? Clearly (ehm) not, since no interpretation can be proved or disproved. Does it mean "inevitable", as in "it can be proven from the premises, given some effort"? Nope, not that, either. So, no point arguing over whether MWI is obvious until everyone agrees what "obvious" means and how to check for obviousness.