I was affiliated with some sufi tariqahs (brotherhoods). "More spiritual," perhaps but in the end just as obsessed with shariah nitpicking - if not more so.
Indeed.
As I said in the OP, it's simply naive to think that Sufism somehow offers a complete deviation from the mainstream Shari'ah. Sufis just appreciate a more numinous aspect of the religion, they don't necessarily reject Islamic law at all. In fact, most Sufis probably are just orthodox Muslims with who also happen to practice Sufism.
I'm pretty sure Hasan al-Banna's Muslim Brotherhood took quite a favourable opinion on Sufism, and they may well still do. The traditionalists on the Indian subcontinent like Taqi Usmani, Shabbir Ahmad Usmani, while being staunch proponents of Islamic orthodoxy, are and were practitioners of Sufism. Indeed, I even recall reading something in Ma'ariful Qur'an about how Sufi tariqas are primarily to give an individual a greater understanding and practice of the Shariah. Even Western converts like Aisha Bewley, Gai Eaton, Abdulqadir al-Sufi, et al., devotes of Sufism, still retain(ed) faith in the notion of the political component of Islam and its other more traditional elements.