4) Your math on years of education is off generally speaking. A DNP is required to have a BSN (4 years), DNP school (another 4 years) and almost every program I've seen requires 1 year on the job as an RN, prefer 2 (and yes I disagree with those that are will to "fast track BSNs" to DNP. Part of the point of our not needing a residency is that we worked in the real world for at least a bit. By my count BS is 4 years, 4 years med, 3 years residency makes the total 11 vs 9. Considering compensation and scope differences, I'm a bit disappointed in some medical specialties getting off so light.
I'm afraid it is you that has your math off.
NP school where I am at is 18 months, so that's 4 years of nursing school, no requirement for clinical expereince, and 18 months of "nursing theory". 5.5 years. Add in a DNP on top of that, what's that 1 year to 18 months extra tops if they already have the NP? So 7 years? But, since your time is off in my area I will bet you are correct in your local area so say it is 9 years.
Now for medicine you are SOMEWHAT correct, 4 years of undergrad, 4 years of medschool and 3 years of residency for family practice/IM. OB is 4 years of residency, cardiology is an IM residency plus a fellowship, Surgery is 5-7 years of residency, CT surgery is that plus fellowship, peds surgery same thing. So no, the specialties don't "get off light".
So, aside from being so wrong about the sepcialties best case you have 9 years vs 11 years. Now try and compare them.
Undergrad
Nursing Math vs Calculus and Phyisics
Chemistry 101 vs Organic Chemistry
On and on and on.
Now get to medical school and NP school.
What others have said is true, you can't fathom the degree of difficulty until you have been there. You can THINK you know, but you have no clue. You cover the amount of material of a week of a 400 level science course in one lecture, so each week of med school is roughly one month of 400 level science courses. It's like drinking from a fire hydrant.
Where as NP school, which I have no personal knowledge except rotating with our own, is more low keyed, on the pace of basic undergraduate courses with a few clinical hours thrown in. The have to read a whole four chapters for the exam, while their med student counterparts have to read 4 chapters for their 1 hour lecture. It's apples and oranges.
Then you have residency, 80 hours per week every week for a minimum of 3 years, 10-12 years depending on the speciality.
I had more hours in first year of medical school than a DNP gets in their entire education (it was an eye opener to realize that 15 hours by the catalog in med school is in reality 40 if calculated like undergrad).
It's not even close.