Thanks for linking that other thread. As far as I've seen with field installs, our technical experts recommend pre-filling. For example, this Fleetguard LF14000NN is our most popular lube filter, and filter in general, in the world today...#1 selling part number by volume; the installation literature says to pre-fill with new/clean oil:
https://www.cumminsfiltration.com/sites/default/files/MB10566.pdf
That being said, on a light duty/passenger car application with such a tiny filter, it's probably not the end of the world if you don't pre-fill. The duty cycles of a small displacement gasoline engine are so much less intense than an HD or HHP engine. From what I was taught and have read, hydraulic fluid can be "new" and still not meet the recommended ISO cleanliness standards for some hydraulic systems due to the very tight tolerances of some of those components like actuators, valves and whatnot. So pre-filling in those instances could theoretically pose an issue longer term, but again, that's probably more specific to HD and HHP equipment.
PS: For anyone wondering, CAT doesn't manufacture their own filters...they're private branding those from someone without a doubt. CAT has done a masterful job scaring people into thinking they MUST use the CAT branded filter or else they will void their warranty, and that's actually illegal unless CAT is giving those filters to you free of charge (Magnusson Moss Act). When I get some time, I'll share some media images comparing a CAT product and the direct cross to a Fleetguard product that we recently released...you guys may find that interesting.