I don't think being more professional/collegial and less dishonest in an interview leads to monocultures. Ideally it would just reflect well on the person for not obviously trying to game the system. If that actually leads to someone being less likely to get a job someplace, well that's a place you wouldn't want to work at anyway.
You don't need every job you apply for. You only need one.
When you get that one job, you want good relationship with your manager. Trying to game the system means your manager will have higher expectations that will not be met, causing possibly dissapointment or trust issues.
By trying to game the system you have almost 100% chance of damaging your future relationship. You need to ask yourself whether that's something you want.
That exposes a real problem. WIth people gaming the interview process that is good advice.
But it surely it is part of the process that leads to mono cultures? Workplaces with 25-35 year old white men? (Or what ever)
How can you get a diverse good group? Does diversity matter? I think it does, am I right?