Light twins not using contra-rotating propellers

Recently, Stefan posted:

Neil Gould schrieb:

distinguish between design defects and design _trade-offs_

Agreed.

for example would you prefer 3-axis trim or better avionics and
moving map GPS?

Personally, I'd choose the trim without having to contemplate one
second. That's why I actually think that the lack of a three axis trim
is a defect. But then, I also think that an engine which has a
dispacement of 360 cubic inch and burns 10 US gallons per hour only to
produce a mere 180 hp (actually much less in cruse) should be called
defect in the 21th century. But I'm getting OT.

Then, I guess we disagree on the meaning of the term "defect". It may be a
defect if it is an unintentional outcome, but I fail to see how simply
being a different choice or priority qualifies under the definitions I
know of. For example:

Dictionary.com Unabridged (v 1.0.1) - Cite This Source
defect /n. Pronunciation Key - Show Spelled Pronunciation[n. dee-fekt,
di-fekt; v. di-fekt] Pronunciation Key - Show IPA Pronunciation
–noun
1. a shortcoming, fault, or imperfection: a defect in an argument; a
defect in a machine.
2. lack or want, esp. of something essential to perfection or
completeness; deficiency: a defect in hearing.
(rest snipped)
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#2 might seem closer to your usage, but if that is gauge, then all
manufactured items are defective, and the term becomes meaningless or at
least redundant.

Neil