If you don’t like some of the costs, go with another lender, or negotiate those with your loan officer.
I’m not sure what this tool is offering that individuals don’t already have.
However in practice it's more complicated. Homebuyers receive these documents after they already signed a binding contract to purchase. Most people don't even know what questions to ask, much less how to properly negotiate, and they're under the stress of just getting the deal done which include affording a down payment, getting a home appraisal, and making sure they're not getting into a bad deal.
Also throughout the closing, the real estate agent/mortgage broker/lender aren't incentivized to get the buyer the best deal; they usually just want to close. In general the mortgage broker/lender are not going to advise and how the customer how to shop around since it's technically illegal for them to give a "bad" loan to a buyer.