This is my understanding of it:
Tasawwuf (Sufism) is a broad term. I know Sufis that follow Sharia. Sharia is exoteric(outer), Tasawwuf/Tazki is the esoteric(inner).
"Al-Ghazzali" writes that you have to learn Sharia first, and there has to be a balance.
However there are sufis that have a lot...