@JeremyECrawford @cawoodpublish why can't high level wizards concentrate on more then one spell?

— Oskar581- Josh Hanna (@Oskar581Hanna) March 21, 2016

The concentration rule is a key way spellcasting is kept in check and play is kept from bogging down. #DnD https://t.co/hBoqCOBOko

— Jeremy Crawford (@JeremyECrawford) March 29, 2016