I think the warm-fuzzies from an engineering solution could be quite significant.

Throughout the day, if I had encountered a live or dead frog in my stairwell, my mind might return to the subject of frogs caught in stairwells several times. If I had saved the frog by hand, I would feel some satisfaction (tinged with some cynicism, see here) but also anxiety that I could not always be there for every frog. With the engineering solution, I would feel proud about human ingenuity and happy about all the potential frogs I could be saving any moment. Lots and lots of warm fuzzies.