That is just not a factual statement. CRNA schools take many med-school or med-school-like classes but not most. If they did, they would be longer than they are.
I'm not sure what your background is, but I can tell you that if you want to be a doctor, you really should go to medical school. There is no substitute. Universally, everyone I know that wanted to go to medical school but went to CRNA, NP, or PA school wound up unhappy (and my n=a bunch). Many of them wound up going to medical school years later. There is no shortage of NPs, PAs, CRNAs, or PTs in medical school and most will tell you the same thing.
To all the midlevels out there, before the flaming begins, I'm really not bashing you. I think there is a place in healthcare for all providers. I have met some really sharp midlevels. I'm also not denying that some of the programs are solid and can be difficult with some programs (CRNA and PA) even taking some classes with med students.
The fact remains that the training is different. Medical school is far more in depth and comprehensive than CRNA, NP, or PA school. It's ridiculous that this even gets debated on this forum.
Again, do some serious soul searching. If you want to be a physician, go to medical school. There are a lot of people in all phases of life and a multitude of backgrounds that have done it. If you really want to be a NP or CRNA, then go for it. They have a good gig. Just please do us a favor. If you have the desire to be a physician don't "settle" for something else. All that does is breed problems for everybody.