But it isn't that complicated to have to court your merchants, build a great fleet or protect your trade route...?I agree fully with the OP. But Paradox wants to provide instant gratification to its players because most of its player base are casuals rather than min-maxers and hardcore RP players. And I agree with that too. It's just common business sense. It would also make EU4 far more complicated and leave stuff like trade and development upto luck.
That being said, implementing a system of dynamic development while keeping the current development method by button would solve both issues. It allows you, the government, to invest in developing a province, and also accounts for natural development by the passage of time.
It seems simple enough and quite fun in SP, in MP making CoT dynamic could be revolutionary to gameplay