The evidence you offer does not go so far as to support an inference of bimodality, only that there is some sort of broad distribution. That is as far as my personal experience of the matter goes, as well.
Some teachers in the field think they see bimodality in their classes, though there is some evidence [1] that this is a result of teaching to those with prior experience. One might guess (but cannot assume) that this carries over to the workplace, but also that it could be mitigated by better teaching.
[1]Anthony Robins. Learning edge momentum: A new account of outcomes. Computer Science Education, 20(1):37–71, 2010.
Some teachers in the field think they see bimodality in their classes, though there is some evidence [1] that this is a result of teaching to those with prior experience. One might guess (but cannot assume) that this carries over to the workplace, but also that it could be mitigated by better teaching.
[1]Anthony Robins. Learning edge momentum: A new account of outcomes. Computer Science Education, 20(1):37–71, 2010.