The main advantage of 1. Nf3 is that it allows you to dodge a lot of uncomfortable openings. For instance if you don’t like to face the Dutch you should consider starting with 1. Nf3. Here is a forced line that effectively deals with the so called “refutation that every russian schoolboy knows” in the Lisitsin Gambit.
This line is also quite cute:
Another advantage of starting with 1.Nf3 is that you have the option of dodging the whole Slav-complex.
…. and the Grünfeld too!
For the record, I should mention that this line is not a forced draw:
White has a very simple way to achieve the desired result though: