Yeah, the episodic nature of novels on Tapas and Wattpad doesn't lend itself very well to the drafting process. (Unless you treat the Tapas version of your story as akin to a second draft or something.) Many novelists will change huge chunks of their story throughout the drafting process, altering plotlines, creating side-plots, writing characters in or out, and so-on. You can't do that if you're posting things as you're writing them.
It's similar with episodic comics, but at least with comics, the art takes such a long time to make that there's a lot of scope to change the story - even if you're only writing a little bit ahead. Just the other week, I changed the upcoming primary setting of my comic to be a spaceship rather than a planetside base, removed a character, changed another character from captain to gunner, added a bridge commander, un-marked a character I originally intended to kill off, and found a different job(s) for the character who was supposed to replace the going-to-be-dead one.
That's a lot of change! Had I been writing a novel on Tapas, and posting as I wrote it, it'd be way too late for any of that. I'd be well past having established all of those things in the story, and probably be deep into Chapter 3 by now, if not beyond. But, since I've only just finished drawing the true inciting incident, I was able to make all of those substantial last-minute changes just before my comic reached the point where they're set in stone. The setting and characters are all much more streamlined now. They were good changes, and I'm glad I figured them out in time.
I'm constantly refining dialogue, all the way up to story boarding the episode it's going to be in. While I don't track draft numbers, those changes would add up to several by the time the dialogue is in a bubble and posted.
I'd advise treating your novel similarly. You don't have to have the whole thing drafted, but I'd say having at least half of it sketched out, and not posting chapters too quickly, will give you the wiggle room to make changes, to create your first draft in a more carefree manner, and save the perfectionists eye for the refinement stage. That's where it's at its most useful.
All that said, what works for one writer may not work for another. And while I do dabble in long-form writing occasionally, I've never written a novel. So take all my advice with a grain of salt, and pick from it what works best for you.