It is exactly true....................
With respect to Tablighi Jamaat and Tasawwuf.
On internet you will find 2 group of people
1. One Group will leave hundred and thousands of good and merits and benefit of Tasawwuf ..........
and will leave hundred of thousands of Good Sufis like Imam Hasan Basri, Abdul Qadir Jeelani,Mujaddid Al Fathani Shah Waliullah, Shah Ismaeel Shaheed
Tabligh Jamaat is just work/effort of tabligh. Tasawwuf is a science. A comparison between the two is like comparing Tabligh Jamaat to Tajweed, or Tabligh Jamaat to Fiqh.............
WHAT IS TASAWWUF/IHSAN/TAZKIYA ??????????
Tasawwuf is the science dedicated towards improving the state of heart to such an extent that nothing other than Allah exists in the heart.
The Qur'an says, in Surat Maryam,
"Surely We have revealed the Remembrance, and surely We shall preserve it" (Qur'an 15:9), Then He says,
"And those who believe are greater in love for Allah" (Qur'an 2:165),
Hadith of Jibraeel in Bukhari and Muslim say......
.................he said, "Now tell me about the perfection of faith (Ihsan)," and the Prophet (Allah bless him and give him peace) answered: "It is to worship Allah as if you see Him, and if you see Him not, He nevertheless sees you." .............(Sahih Muslim, 1.37: hadith 8).................................
When a person has managed to expel all other than Allah from the heart, and has implanted the perpetual zikr of Allah in the heart, then the iklhaas and the acceptability of his deeds reaches a different level altogether.
At that stage the barakah that emanates from his actions will be unmatched by others who have not been able to reach the same degree of ikhlaas, love for, and perpetual zikr of Allah.
One only has to look at the training undergone by the recent Mujaddids whose work has touched and transformed millions of people, such as Mujaddid Alf Thani,Shah Waliullah, Maulana Ilyas Khandlewi, to understand the reason why Allah placed so much Barakah in every action they took.
Their hearts attained such a stage of purity that everything they touched turned to gold.
Others may put deeni effort under the same conditions for a thousand years without being able to achieve the same results.