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Ultimately, the ethical responsibility is to choose the best client representation over the most readable contract, right? Those don't always overlap, do they?It depends on what's meant by "the best client representation" — is it "best" for the lawyer, or for the client?
What clients want — pretty much universally — is a contract that:
* sensibly and understandably handles the usual use cases;
* addresses the important business risks; and
* can be negotiated and signed quickly — in many cases that might be the client's most-important consideration, because the client is confident that the deal will go smoothly and/or that the business risks are low — and an understandable contract draft can be negotiated far more quickly than a draft that's loaded with "wall of words" provisions.
(The old saying is that most contracts are signed and never seen again, either because the deal goes smoothly or the business people work out any difficulties between themselves without getting lawyers involved.)
Almost never do clients give a [hoot] about maximizing their theoretical legal position for every conceivable set of circumstances — in fact, they're actively hostile to doing so if it means undue delay in getting the deal to signature.
A relevant Dilbert cartoon: https://dilbert.com/strip/2008-08-28
(Source: 40 years of law practice, including nearly seven years as vice president and general counsel of a public software company that I'd helped the founders to start.)