Light twins not using contra-rotating propellers

Mark Levin writes:

As was pointed out to me the Beechcraft Baron does not use contra-rotating
propellers. A bit of research showed me that most U.S. built light twins do
not use them either.

My question is why?

My guess is that the market for mirror-image engines (the most
straightforward implementation) is too small. If you don't use mirror
images, you have asymmetries in the powerplant engineering.

I do wish that things were different. I consider the effects of
P-factor and torque to be design defects.

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