I don’t know if this is completely true, as the L&S Economics Major career survey showed quite a few IB and other finance positions as first destinations( available at https://career.berkeley.edu/survey/survey , narrow by “CLG of L&S” and “Economics” in top right)
I do agree with this, I don’t think I would do an MBA if I got a BBA at Haas. I’m not sure what my plans would look like if I went to Kelley, as an MBA may afford me new opportunities in fields that Kelley may not place that well into.