Should I feel bad knowing that ... someone wasted valuable time... No, but you should feel bad for thinking "it looks pretty" ==> "someone spent a lot of time

Should I feel bad knowing that ... someone wasted valuable time... No, but you should feel bad for thinking "it looks pretty" ==> "someone spent a lot of time making it look that way." In particular, what you need to consider is: maybe they didn't spend all that much time on the visuals. Maybe they were either just really experienced, and it took next to no effort to get it to look that way... or maybe they had next to no knowledge, but used a framework to make it look as if they did. I find this is a very common mistake managers make, BTW: assuming they can estimate, in the blink of an eye, how long it took to get a certain feature or behavior of an app into existence, out of nothing (and quite often, getting this estimate off by an order of magnitude in one direction or the other).