[scarymike]

I agree this is a bit of a problem. It's easy to miss this rule, so adding via adjustment isn't a great solution.

Edit:

Here is a concrete example:

1. Take a race that gives you a skill, such as Intimidation (Half Orc)
2. Take a background that grants the same proficiency (Soldier)

At this point, by the rules, you should be able to pick a different skill to be proficient in, since you obtained Intimidation twice.