I found a great recipe for chocolate cake, so I went to the store and bought a bag of flour (I don't see why I should get my dishes dirty and baking makes my kitchen so hot in the summer) and ate it and it was absolutely the worst chocolate cake I have ever had.

(You absolutely do not have to justify code you write to anyone but your stakeholders, but the reason several experienced people said "Hmm... wait a minute, did you think about ____?" is either because they have done the same thing and it didn't work out for them or because you're so much smarter or luckier than all of them that they just don't understand what you're trying to do.)