It certainly is not subjective, in that people are far more used to dealing with whole numbers than decimals. Try reading the first one, then reading the second one. Tell those numbers to someone else, have them write it down, and see how many people screw up the first vs. the second. This has nothing to do with whether it "looks expensive". There are reasons for wanting the numbers to be higher as well, as evidenced by the number of Dogecoin enthusiasts who like "having more", even if it doesn't matter. That part gets more subjective, but still favors micros in most cases. Sure, 3000 may sound like a lot, but if you have a lot more, it's all a different scale.
If the argument is for keeping things based on what is already done, why even switch to millis? After all, everyone is used to full Bitcoins, why even change to millis? Whatever your arguments are there, for switching base bitcoins to millis, try to see why they fail at micros (other than the subjective argument that I'm used to decimal units of currency being worth a cup of coffee, even though numerous people all over the world don't have that conditioning).