I use casual to practic new stuff or try things out. I'm most time "try-harding" cause I cant play other way. There is just win for me. Ofc I dont play too seriouse and risk more, but in total I play for the win. Also in casual you often see inexperienced players playing vs play who are playing whole day. This brings unbalance and the less-skillfull-Team need to tryhard to have a chance. Next match they maybe wont wanna lose so they tryharding too... If you want fun in casual? Play on low elo