IRS Changed reporting requirements.

When you filled out the capital gains detail worksheet each of those transactions flowed through the 8949 and then onto schedule B.  Now you just open the 1099-B (even if you didn't receive one) and report the aggregate data for each brokerage account (which is probably what everyone was doing anyway).  They already have the detailed information so it saves the people who were doing things correctly from putting in multiple individual transactions.