reputation of the endorser is important when considering whether to trust a solution or not
you can incentivize mods to endorse answers well so they get more publicity for themselves and any company they may represent
you can identify mods who endorse wrong answers and train them to do better
makes it clear that a mod has endorsed the correct answer, not the OP
i.e., lots of people have a mental model of how this feature works from stack overflow, where the OP can mark the answer correct. This is unwise for applications where you can’t immediately verify the solution works, and the OP doesn’t have authority on whether the solution is correct, e.g. tax law as is the case for my tax advice discussion board/forum
I’m not too picky here, but at the minimum the endorser’s name should be prominently displayed and a hyperlink to their profile included:
Wouldn’t the presentation of that be useful? If OP doesn’t mark it as solved, then I’d at least like to know that it was marked solved by someone with a solid background in the topic, and not just someone with the power to do so.
Surely moderation should be traceable and transparent as often as possible? This improves both of those factors.
I agree that those who have that power should use it carefully.
I am not sure if the solution would be “at the minimum the endorser’s name should be prominently displayed and a hyperlink to their profile included” though.