The oboe, unlike the clarinet, never benefitted from having its keywork modernised to the Boehm system. They're not world's apart, but...
And then you've got the double reed/tight embouchure/high lung pressure to deal with.
A friend teaches oboe and accordion. Funny how similar they can sound. What really surprised me is how natural the oboe can sound playing Bandoneon parts from Piazzola.