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How many lead devels on OSS projects would bend before a pro UID who would contribute to the project?

There are projects for which mainstream UI design is unsuited or unimportant, and there are undoubtedly a few people whose egos would prevent it.

Apart from those, I would expect most projects would be happy to accept advice if the UID demonstrated competence.

Than how do we get UIDs to contribute to OSS?

At a guess, a large number of them.