Here is an observation:
Panel: This is my current settings. I was clicking through each of those toggles before I got to this point (below The Tolerance: 3 area) because I was searching for how to match up points along the X-axis...
So I would expect "Size References" or "Snap to Points" to perhaps work for this task, but I'd just be guessing. In this case though nothing is activated in the immediate options area, it is snapping to the references I need, so it's rather confusing what is/isn't possible with this option spread depending on what is toggled at a glance. Hopefully that makes sense.
Snap to X-axis (for points):
I couldn't tell easily that the small text was indicating it was snapping to points. The pen icon is overshadowing the little point and the point is larger, so it makes it difficult to know if it's actually "on" or not. If I were to have other things toggled and it were picking up quite a few connections, then I'd have to check sometimes in Transform panel to see if it is snapping where I expect. I think having a line that cuts across from the other point would be helpful to know which point is snapping to, much like how it is done in other programs. That said, I do appreciate the minimalism and it shows the distance with precision also, which is a very nice feature in VS.