> we have hundreds of engineers shipping hundreds of commits every day

Can someone with (any) experience explain to me why do seemingly perfectly functional websites need change all the time? Is the production version hacked together or what? Why can't websites be coded once and left to run with the rest of the effort being devoted to maintance/adding more servers as the load increases?

I admit that I know almost nothing about how large codebases function (it might being apparent judging by the question)