Islam is actually easy in the beginning, do this and dont do that. But, Sufism has found other area which is bathin ( psychological) and focus on that. And Wahhabism and Salafis focus on do this and dont do that only, dont try to put more effort on psychological area of Islam. Hasan Basri itself (one of Sahabah) has said about secret on Islam ( I read from Al-Ghazali book, Ihya Ulumuddin).
But Sufism in the time of Ibnu Taimiyah really make Tasawuf becomes so complex. So Ibnu Taimiyah and his student effort (Ibnu Qayim) is actually good one, to make Islam becomes simple once more and more pure. In the old time in which Salafis and Wahhabism hasnt yet revealed, all Muslim scholars learning in Baghdad need to learn both Sufism and Hadith.
Well what can I say bro, sufism Tasawuf are beyond me, I gave it a try when I was teenager and then again in my early twenties but then I realised its easy to follow Sirat E Mustaqeem in simple plain terms than wasting time understanding and searching someone that is always there when I need HIM and ask for his blessing wholeheartedly ................... in the end I would be asked for my personal actions and my responsibility as a Muslim to the society, I don't think so I will be asked which interpretation did you use, which turban you wore, which sect you followed, and I don't think so anybody else would share the burden of my sins and actions.
To boil down the complete sufism concept in one sentence. Perform Zikar , Darood with every breath you inhale and exhale so not to miss single moment which goes by without remembering the creator
Original and Real sufi have a saying which translates to " A missing breathe which goes by without remembering Allah is akin to death for us"
Sufism began with strict observance of 5 prayers along with Tahajjud prayer. You can't miss these 6 prayers. Once you achieve that, then they began teaching you breathing exercises, how to perform Zikar and darood with every breath you take. Once you achieve that, The final journey then began of Remebering Allah and his Nabi (SAWW) with each heart beat. You have to synchronize your Zikar and darood with your heartbeat.
A person becomes so pre-occupied with himself that He achieves that Zenith which Allah has descirbed in Hadith e Qudsi
"Allah Most High says: "He who is hostile to a friend of Mine I declare war against. My slave approaches Me with nothing more beloved to Me than what I have made obligatory upon him, and My slave keeps drawing nearer to Me with voluntary works until I love him. And when I love him, I am his hearing with which he hears, his sight with which he sees, his hand with which he seizes, and his foot with which he walks. If he asks me, I will surely give to him, and if he seeks refuge in Me, I will surely protect him"
(Fath al-Bari, 11.34041, hadith 6502);
This hadith was related by Imam Bukhari, Ahmad ibn Hanbal, al-Bayhaqi, and others with multiple contiguous chains of transmission, and is sahih."
This is why Real and original sufis don't engage in sectarianism. They are so pre-occupied with themselves and zikar which they perform 15-20 hours everyday that there is no time for them to engage in trivial matters which causes fitnah among muslims