Why would we want Hayward?
Do you want a 6'8 Small Forward who shot 40% from 3pt last season and led his team in scoring?
He also upped his performance in the playoffs, increasing his ppg, apg, rpg, and increased his 3pt%.
A tall wing in his prime who shoots extremely efficient from all over the court, and gets better when the pressure gets higher.
There's a lot more reasons but these basic ones should help.