It’s obvious ...

When used alone in a typology comment, it often implies that the typist themselves couldn't come up with a good argument.

Related logical fallacies

Proof by assertion

• Proof by assertion, sometimes informally referred to as proof by repeated assertion, is an informal fallacy in which a proposition is repeatedly restated regardless of contradiction and refutation. Sometimes, this may be repeated until challenges cease, letting the proponent assert it as fact due to a lack of challengers. In other cases, its repetition may be cited as evidence of its truth, in a variant of the appeal to authority or appeal to belief fallacies. (From wikipedia)

Argument from ignorance

• Argument from ignorance is a fallacy in informal logic. It asserts that a proposition is true because it has not yet been proven false or a proposition is false because it has not yet been proven true. This represents a type of false dichotomy in that it excludes the possibility that there may have been an insufficient investigation to prove that the proposition is either true or false. It also does not allow for the possibility that the answer is unknowable, only knowable in the future, or neither completely true nor completely false. In debates, appealing to ignorance is sometimes an attempt to shift the burden of proof. (From wikipedia)