I think this needs to be said to a lot of stubborn egotistical designers too.
Ego in some ways is good but needs to be controlled and put aside so projects get the most effective outcome.
Absolutely. Same for designer, strategists, etc - however for some roles it's easier to "hack stuff together" than others.
I've seen designers simply copy and paste from an "inspirational" pinterest board, strategists copy and paste the first idea from an article or speech or book - hacking stuff together is for more than simply technical people.