It depends, you see. It depends on the other habits one has already established and how their brain are wired. For some who have a shitty self-discipline it could be a really toxic habit that is disturbing them on a daily basis from the work that they should be doing or the goals that they want to be achieving, and use it as an escape stimuli, the same way, for instance, junk food, television or purposeless browsing could be used. You find yourself in a difficult situation that requires your persistence (e.g. in the middle of assignment) and then procrastinate it by fapping which then might trigger other bad habits that get your work unfinished. But in most cases, guys are using "no fap" as a vehicle to start going out, meeting women, "pulling the trigger" (a.k.a. kiss the girl, touch, pull) or getting a girlfriend. This is case, because if you're a guy who doesn't have much experience with women and are addicted to fapping (more than once per day), you will not have enough motivation and sexual energy to do any of those things, because your libido will be satisfied. So, "no fap" as I've noticed is used for guys who are in this kind of situation.
However, for guys who don't have any of these problems, who do their work, meet women regularly or have a girlfriend, gets sex, this "no fap" thing might look weird and is irrelevant as in your case. And I agree with you that to get erection regularly is very important, but if it's an obsession/addiction and kills productivity, then you need to moderate it and use it as a reward mechanism, or go "cold turkey". So the bottom line - fap as long as it doesn't disturbs your life!
