We should encourage all Jews to read the entire tikkun, including those who feel that they could “better” spend their time in a more in-depth study of Torah…
For the true preparation for receiving the Torah is to recite the entire tikkun leil shavuos from beginning to end.
If a person was not particular to do so in past years, he should resolve to say the entire Tikkun from now on.
Counting Mitzvos Late at Night
I wish to negate the opinion of those who claim, “Why should we ‘squander’ our time by reciting the tikkun?” They maintain that they could spend the same time on the in-depth study of hemshech ayin-beis (a series of complex Chassidic discourses) or something similar from the Torah’s inner teachings—instead of simply reciting the tikkun and counting the 613 Mitzvos.
Note the precise description of “counting” the Mitzvos. Generally speaking, by the time one reaches the list of Mitzvos at the conclusion of the tikkun, the night is almost over; he is already thinking about going to immerse in the Mikvah and prepare himself for his morning prayers—including hearing the reading of the Ten Commandments. By then he is exhausted and cannot contemplate the content of each Mitzvah—certainly not their spiritual content. All he can do is simply “count” the Mitzvos.
Parshas Bamidbar, Sivan 6, 5748. Hisvaaduyos, p. 246.