Let me take a moment to introduce you to a fella who has largely gone unnoticed in Stack Exchange pop culture, Darin Dimitrov. This Stack Overflow user doesn't have a Darin Dimitrov facts page, nor is he treated like the minor celebrity that Jon Skeet has become, yet this person is Stack Overflow's #2 user, sporting a reputation of 378,615 at the time of this writing.
Darin Dimitrov has a whopping 27 gold badges, 618 silver badges, and 853 bronze badges, which is more than many of us have on the entire network! As you can see from one of his posts, he's nowhere near breaking the UI:
Thus, the feature that we're discussing here only visually affects a single user's profile on not just Stack Overflow but the entire Stack Exchange network.
Jon Skeet has answered a total of 23,486 questions on Stack Overflow, out of over 4,000,000 questions on the site, which represents only 0.58% of the total posts on the site. In short, not many people are exposed to what is arguably a borderline case on the network.
I suspect that it wouldn't be hard to update the flair to just round the numbers to "3k" or something like that, and I'm sure that Stack Exchange developers could put a fix in very quickly for this. However, I don't believe it's a huge priority that should be tackled over features that directly improve the Q&A.