The “Basic” line only became problematic, in my view, from two factors: 1) Incompatibility—there is a difference between fewer/more rules and different rules. It didn’t have to be so deliberately different a lot of the time. 2) Companion/Master/Immortal rules were not necessary if the assumption is that people getting that much into it could advance to Advanced. In other words, you’re right, there was some unnecessary overlap.
That said, both those factors are so minor that they don’t actually bother me.