Because people were severely underleveled and were also caught by surprise. I was 335 in heroic Pyramidion and dropped right at the boss. It was a learning experience for sure but after a few wipes we(randoms)got it. After light levels rise heroic strikes will feel almost just like before but somedays they will be harder and somedays a little easier because of the modifiers. People should remember to take time to adapt and allow others time to adapt too.