What are you talking about? Do you understand the process involved in acquiring a machine? A prescription, in my name, has to be generated and supplied to the company that sells the equipment, unless buying a used machine. Guess who generates said prescription and suppled it to the company that I purschased the machine from? Right, my sleep doc's office.
Do YOU understand that's not the only way to acquire a machine and sometimes doing that way is very expensive? Many people have found that when they buy out of pocket at a DME they get a raw deal, because they pay way more than they could have if they used another option. Some DME's get away with charging their "fantasy price" which can be double what you pay online because they seem to be the only option to an overwhelmed newly-diagnosed person, though they are not.
Your statement "I recently purchased a new ResMed machine on my own dime' could have meant that you used other means as many of us here do:
1. Purchase online from our hosts at cpap.com or another online provider. Prescription required, but nothing is reported at all to your doctor.
2. Purchased used, as you state. Prescription generally not required, no report to your doctor.
3. Borrowed or gifted from a friend or family member.
Just because a doctor referred you to a particular DME doesn't mean you had to use
that DME, either. And AFAIK, DME's don't send the doctor a letter saying "so and so purchased XYZ machine from us, what data would you like?". In some states, it's legal for a doctor to own an interest in the medical supply company he or she refers to.
I was pointing out that very few doctors even pay attention to the data, other than to document compliance for insurance reimbursement. You don't need to report compliance for an out of pocket purchase.
Since you have no compliance requirements, there's no guarantee that your doctor's office will have bothered to get any data from the DME on your behalf. "All the info we need" could mean they are getting full efficacy data to really delve into optimizing your therapy or it could mean they are getting no info at all because they don't care. Hopefully you have a great doc who does pay attention to the data and adjusts your therapy accordingly, but in many (most!) cases the doctors don't even bother.
Ask your doctor to show you the data he/she has next time. It will either be a really good discussion with an involved doctor, or you will learn just how much "all the info we need" means to that practice.