It's winter, nobody is concentrating well. Also, will it terrify you if I say you are not 20 anymore and people have their peak mad programming/mathsing/similar ability around that age? Peak wisdom and ability to design large things has a much later peak at an age older than you are, helpfully, so you will become even more brilliant at designing programs, then you can pay a bunch of teenagers to do the tedious debugging bits :D

Beg to disagree on the generic comment "It's winter, nobody is concentrating well.", although not on the specific application to simont of whose seasonal preferences I have no idea, since I'm one of those awkward people who can't concentrate when it's sunny and hot, and too light etc...