Edit: The White House has not explained why they are doing this. Here is one possible excuse for Biden. Note that I have not found any support for this idea, so the excuse is speculation.
Traditionally (not a rule), the Senate will not approve a judicial nomination for a Senator's home state unless both Senators from the state agree. This is called
Blue Slip, named such because the Senate Judiciary Committee uses a blue slip to solicit their opinion. It also
applies to US Attorney nominations. This is not a law or a Senate rule, so the senate can dispense with it. McConnell in fact
dispensed with it to confirm Trump's nominations.
It is possible that Manchin, Sinema, and/or more Democratic Senators demanded the restoration of the blue slip practice, making it impossible to confirm judges and US Attorneys to Kentucky unless Mitch McConnell and Rand Paul both agree. I am unable to find any information that supports this idea, but it is the only plausible excuse I can think of.
It still does not excuse sidestepping the Kentucky Democrats (the governor and the state's only Democratic congressional member) to deal with McConnell though.