For me, all my trouble comes from my party members. I understand my character and his limitations, but managing classes that I don’t fully understand has led to me greying out spells due to armor restrictions or causing my party to accidentally split because the wizard, weighed down by cloth, a book, and a cane, can’t jump as high as my fully-kitted out fighter with ringmail and a greatsword and now is alone in combat against some CR3 monster.