It's really based on personal preference, but I believe that it does make your design look better.
Moreover, fillet can help you save some money on filament and eliminates sharp points or edges.
Yes, I believe that filleting can make your designs look better (but not always). There is a reason why in the design industry, people use squircles (square that is filleted) instead of squares. An example of this happening is in the app logos in phones. There is a reason why your app store or itunes logo is not a perfect square.
the army does care about its soilders sir i think yout getting off on the wrong foot sir you need to respect our country were keeping the peole that want to d harm towards you out. so dont go saying we don't care cause we do