Generally - I'd say its a case of "your gear is better than mine... Bet I can find faults in it though!" However in other cases it is "We all know you can do better... What happened?"
Some times I'm sure its just to get up the persons nose...
I think it can be constructive at times.. It may be such a subtle defect that you yourself don't notice it until someone points it out.. and whilst at face value, that is annoying, once that tiny defect is sorted out, be it via processing or slight hardware changes, isn't it then satisfying to know that the problem is gone??
If you have to zoom to 400% to notice problems, the problem does not need to be worried about. If it can be clearly seen at 100% then you should endeavor to fix it when time/money allows... Thats my policy on it anyway...
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