Lets try the real question? Why is Davis forcing this viewer login?
There's endless scope to speculate, but I'd suggest a couple of functional reasons:
A major change in 2.0 is the ability to have multiple stations in one account (vs 1.0 where each station effectively had its own account). But if the platform doesn't know who you are then how can it show you the list of your stations (where your list might include stations you own; those that have been shared with you; plus any others whose Bulletin data you like to check regularly)?
You may say that most users only have one station, but remember that the 2.0 platform is intended to cater for all Davis stations including EM, where the use of multiple gateways will be commonplace. And farmers often already have multiple VP2 stations, including Connect units. Once the decision was made that there was going to be one single all-embracing 2.0 platform then it had to be designed to accommodate the more demanding multi-station configurations and hence the same rules for everyone.
Second, 2.0 is a large software project. What you see right now is probably the minimum feature-set that Davis felt able to launch with. There will certainly be major new features in development and one of those might conceivably be be re-enabling single URL access to individual station's data. (Purely speculation on my part, but if there were a lot of feedback from users requesting the return of this capability then it might happen.) But right now I suspect the developers' main focus is on ensuring that the mass migration from 1.0 to 2.0 all goes smoothly in 2-3 months time.