My first calculus professor used to tell a story about a professor who was lecturing one day in another class.
He had equations drawn across 3 different black boards and came to the end and said, “and the result at this point is obvious…”, but his voice started to trail off at the end as if all of a sudden he was not absolutely sure. He stood at the board for a moment, then reviewed the other two boards, then looked at the ceiling and waved his hands a bit, and then found and empty spot on the board and wrote a few more equations, then looked very puzzled and turned to the class and said, “Just a minute, I will be right back” and left the room.
The professor returned several minutes later, walked back to the board and said, “yes, it is obvious” and continued with his lecture.
My professor’s point was that we have to be careful that when we say it is obvious, that it really is actually and honestly obvious. Obvious is not just a word to be used to make it seem that we are right with no explanation needed and no argument possible. Statements like, “This feature needs to be changed for obvious reasons.”
That is a great thing about this community - for obvious reasons. No, actually because we discuss all of these issues openly because the same right answer is never obvious to all of us at the same time.