You are asking most difficult question. As I am not doctor/medical person; the issues you raise really require some expertise.
Having used said instrument and struggling with my own condition, the present available tool I used was the Dexcom. My Doctor and I actually caught the actual liver mis-behaviour using caveman machine and 30 strips a day before cgms. The cgms with its data logging confirmed the suspicions as well as providing greater glues to digestive process and timing. One cannot get trend direction on a single caveman strip but requires a number of the caveman strips in a row.
At the present costs of strips, sensors and the cgms; costs are a key concern.
Can you afford that? on a daily basis.
Bloggers I have watched and read seem in my mind struggling with its high cost versus benefit especially on a long term basis.
If money no issue - get one - otherwise you will want to tread carefully.
Whether it can help your specific case; many suggestions I have heard and would seem to be helpful is to get the temporary short range cost limited test review and see if you can get sufficient data to help you sufficiently so you can go back to caveman machine knowing the trends of your body. The only problem with that is the up to speed experience and training to get climatized to the CGMS and its pecularities - a couple of weeks.
More advanced test gear can always surface more detailed data that might assist in your particular case looking at trends, real time fast issues, eating, liver activity so your Doctor/endo can better isolate cure steps, diet, meds that may provide the best hope for stabalizing your issues.
If there was a unit for $ 200, sensors lasted a year - cost of sensor for year was $ 80- and price of test strips was under 20 cents a strip. You bet get one. I prefer having a live gas meter data logger watching me every 5 minutes 24/7 so I can quickly see what my body is doing alomg with the real time gronks and police body tighter allowing me to predict early and prempt problems by a early warning trend system
As to whether you are missing anything, more advanced tools and data logging will always provide more data than one can get on single prick caveman machines - but at what cost impact and value of extra data. This is issue that can only be wrung out with doctors and other specialists. A1c readings will be a gating item as to quality/capability of present diabetes control.
Best wishes. My goal and hope is that we can get costs of the cgms and sensors down to more reasonable high volume PC style of manufacture so they become more available to more people wishing to have better visibilty of glucose trends and body control of their diabetes.