The engine oil filter is made in Indonesia, I didn't check the others. I doubt they are garbage but they are imported for a reason.
Yes, Kubota is a for-profit company and is traded on the Japanese stock exchange so there's a fiduciary responsibilty to the shareholders. Complex machines have parts made all over the world these days, and it makes sense to have a filter made in Indonesia if it meets certain specifications and also increases the company's profit margin. That's good business.
Based on my experience with Kubota products, which has been nothing short of amazing over the past 10+ years with four tractors, a generator and numerous Land Pride implements, I believe that Kubota, like many Japanese companies values their reputation above all else, and I don't think for one second that Kubota would put their name on any part that doesn't meet their very high standards.
Like I said earlier, I don't think I'll ever use a non-Kubota hydraulic oil filter, and frankly, unless another company proves that their oil filters are significantly superior in some way, I see no reason to look beyond Kubota branded engine oil filters either.
Comparing the three oil filters that my MX requires:
WIX filters on Amazon vs. Kubota from Messicks
Engine oil: 51307
$14.60 HH164-32430
$15.74
Hydraulic filter: 57098
$49.50 HHTA0-37710
$61.63
Transmission filter: 57616
$77.78 HHTA0-59900
$86.69
So all three WIX filters from Amazon costs $141.88 compared to $164.06 for the Kubota filters from Messicks (or local dealer), so my incentive to use WIX filters over Kubota is what exactly? $22 difference to assume that the WIX filters meet or exceed Kubota filters just isn't worth it to me, but ultimately we're all free to make our own choices.