I think it depends a lot on where the code you are working on lives in the stack. The further down it is the more it makes sense to do it right. The further u

I think it depends a lot on where the code you are working on lives in the stack. The further down it is the more it makes sense to do it right. The further up it is it becomes a question of whether that code will be around long enough to make worthwhile the more interesting invasive changes required to do it right. An extreme case is A/B tested UI code which has a strong chance of not working out.