Look, you are making comments like: "I suspect that you think that S21 thru calibration do not measure/calibrate Port2 impedance. Well, it does."
I have repeatedly explained the calibration options available for the port 2 calibration, but you say something like that.
Yes. You made such impression. Especially when you said following: "3. 1 path 2 port calibration. I _think this should_ correct for everything and be almost as good as a Full 2 port cal, but requires a manual DUT reversal" when we talk about impedance measurements of symmetric components like resistor, capacitor, inductor. Also knowing that NanoVNA does SOLTI calibration, you believed that it is just scalar analyzer
. Whatever. As you promised to spread your wizdom, please stay tuned. Questions will follow. I will try to ask them one by one.
Your own

isn't helping, and insulting me isn't helping either. You have only made general comments which are something like: 'nanovna can't do it because it has poor dynamic range', and then 'nanovna has everything which is needed' and then 'you think the nano can't measure phase'.
You are just as confusing to communicate with as I don't understand how you are jumping to these conclusions.
Firstly, let me say this: I agree that the nano can do these S11 and S21 measurements. I never said it couldn't. <-- Read this again.The point I am making is that there are different levels of accuracy which can be achieved.
The measurement can be more accurate - or at least as accurate as possible - if we:
* Use the right fixture for the measurement <-- see Brians paper
* Do better fixture removal than just port delay only
* Use a better calibration algorithm.
* Limit the frequency range of the measurement
On the calibration algorithm, as I indicated I am not sure if the 1 path 2 port will turn out to be better than Enhanced Response.
But lets find out...
I will try to find a document describing it and will come back with a reference. Its implemented in scikit-rf I believe.
In the meantime here is something I found where the 8753 designer talks about it briefly:
https://community.keysight.com/thread/5003The 8753C did have a one-path two-port cal, and it was used with the TR test set for the 8753C (85044?). The process for calibration was to connect the DUT, hit trigger, the 8753 would prompt you to reverse the DUT, which you would do, then hit trigger again, and it would gather the both forward and reverse parameters and display all 4 s-parameters. So, it was a real full 2 port measurement (just like the 8510, but I've never used one in that mode).
For "blesia", you must ALWAYS have a path from the 8753 source to the R-channel input. You see, the source is phase locked to the synthesized receiver, but the receiver must have a bit of signal in it (-35 dBm Min), to allow the phase lock to work. The 85044 T/R test set has a splitter inside to provide a reference signal, as well as a bridge for a reflectometer back to A. For transmission the cable just goes straight to B. You must use this test set for the one-path 2-port to work.