'only'? A web developer did not cost 12*30=360$ an hour in 2015, and that's assuming that going "ugh, whatever. I'll just hide the problem with overflow:hidden instead of finding the underlying cause" takes him or her 2 minutes and isn't already the dev's initial reaction

Another way of looking at it is using as much electricity as a normal person in a high-income country uses across ~3 days to add overflow:hidden in the end. Of course, the path to get there did a lot more, but you don't know that beforehand if you don't take a quick peek and make an architectural decision about what the solution should be that gets implemented