Ehh, no need to invoke anything close to "equivalence," even by simple association. You're just feeding that false narrative that too many Republicans have been making and using to hand wave away the problems of their party rather than making any notable effort to actually deal with them. They're rather consistently trying to convince themselves that the absurd partisanship of the current Republican party is just the way the world/politics as a whole really works.
Either way, when an "investigation" into something doesn't even touch a whole lot of the important, available, publicly known, and seemingly very relevant leads, that's a very clear indication that it's not even remotely serious, before even getting to the rest of the serious problems in play in this case. When even the basic functional requirements to qualify due diligence as being met, the people saying that it's not complete have a very strong case to make, regardless of the empty aspersions that those like logger may forward to try to make themselves feel better about the problems that they're trying to sweep under the rug.