I think you just have be aware of it.. if you're willing to give up udder score for other positive attributes which these cattle have.. if they aren't big milkers, the less than desirable teat and udder scores may not really come into play that much, but if the udder suspension is weak and they're bred to a high milking animal, the resulting offspring may have some serious problems.
Teat size.. I don't mind if they're long, as long as they're cylindrical and you can tell where the teat ends and the bag starts.. Udders I look for the teats in a "square", and ideally they're all at about the same level.. the bottom of the bag shouldn't be lower than the navel.. ideally.. at least not in a younger cow
From my own herd, I think this is about as close to a perfect udder as I will ever have
Her mother at 16
10 years of age isn't really a "test" of longevity.. it's like a 50% passing grade on a multiple choice test... When we bought our original herd of 16 mostly herf cows, only one of them lived to be over 10 years old, and a LOT of it was due to bad udders (Hooves and vaginal prolapses too, but I would doubt Lents has that)
I just can't fathom making a step backward in something I've worked hard to get both functional and esthetic in my herd.. they aren't all at my desired level yet though.. This is the one I had to fight with yesterday morning to get the calf on the teats, in a blizzard.. Yeah, she raises a good calf, but it's not the kind of cow that'll be here in 10 years for sure (she's 7 in the pic)
I'd like to see those Lents' cows bags at calving time to really see what they're like.. and what IS the cause of the end of their functional life? Is it by chance the udder? They must get culled for something, and the first thing to look for is your most common cull point, and improve on that.