You are correct. Sherpa does not calculate subsidies. It simply says they exist and you should go find out on healthcare.gov.
I think a nice new feature would be to ask a few questions to project your expected subsidy and calculate it for you. That adds complexity, but not as much complexity as the verification that the government site puts you through. (That's where all the IRS stuff comes in.)
Even with the Sherpa team's disclaimers, they've provided a really valuable service. How many people are going to go to the Sherpa site, quickly get information about what's available to them on the exchange, and decide that the exchange is not their best option? It has to be some double-digit percentage of people who would have wasted a lot of time being frustrated on healthcare.gov.
Basically, the Sherpa team has given us a great heuristic optimization, in which part of the load problem is handed off to where it can be handled easier, more effectively, and more cheaply. Nicely done!
Sure, everything is interconnected, so it would be false to say there's no effect, but "Yay for world peace! All credit to fracking!" is a wild reach.
Motivated reasoning. It's a thing.
I can imagine really young people in a chaotic startup texting and messaging in a meeting because it's how the meeting works.
Think "war room" more than "board room."
Anyone can make an omelet with eggs. The trick is to make one with none.