That assumes that there's no "padding" built in, and that to complete a 4-year CS degree you need to be focused on CS for every class that you take, every minute of the day.
Not a perfect analogy, but: due to my AP scores, I placed out of the first two semesters of the four-semester mathematics requirements. After two years, I didn't know more math than those who didn't place out, I just finished learning it a little earlier.
People with existing programming experience will start off at a slightly higher level than those without, but the latter group will end up in roughly the same place, by taking an elective or three fewer.
And even if they don't, so what? Maybe someone with more experience ends up diving deep into OS design, compiler writing, and database design, while someone with less experience only gets to dive deep into database design. The CS program has still prepared both groups for their first job after they graduate (or their masters/PhD program, if they choose that route), some people might just have less or more to learn later as they grow into the rest of their lives. This is true of pretty much any profession; programming is by no means unique here.
Not a perfect analogy, but: due to my AP scores, I placed out of the first two semesters of the four-semester mathematics requirements. After two years, I didn't know more math than those who didn't place out, I just finished learning it a little earlier.
People with existing programming experience will start off at a slightly higher level than those without, but the latter group will end up in roughly the same place, by taking an elective or three fewer.
And even if they don't, so what? Maybe someone with more experience ends up diving deep into OS design, compiler writing, and database design, while someone with less experience only gets to dive deep into database design. The CS program has still prepared both groups for their first job after they graduate (or their masters/PhD program, if they choose that route), some people might just have less or more to learn later as they grow into the rest of their lives. This is true of pretty much any profession; programming is by no means unique here.