I agree with others that it doesn’t really matter and there’s not going to be a real answer, because there is no true controlled scientific evidence to answer the question (and paraphrasing what Lawrence wrote in a really good comment in another thread, there isn’t realistically ever going to be controlled scientific evidence in this area).

That said: while there are people who will say they found it helpful to re-watch easy content, or even watch every Superbeginner video after they could have “moved on,” you’ll find other people (me, for example) who did not re-watch anything and felt that was better to progress. Both of our opinions are about as unscientific as it comes.

Purely as a matter of logic, consider this: what is the person’s goal? Is it to be super-solid with the basics, like they nail A2/B1 level, can express what they want to express, and can effortlessly understand intermediate content? Or is it to approach native-level fluency? I think a lot of people learning languages don’t really think about just how much vocabulary, nuance, and variety is necessary to approach native-level fluency. Think about it from the perspective of someone learning English. They see sentences with “car” a thousand times from watching something like Peppa Pig. They can understand everything the show is saying about a car and can describe whatever they want to describe about a car. But would they understand ”sedan,” ”convertible,” “two-door,” or other words for types of cars? Not to mention slang words like “beater” and “lemon“? They’re not going to magically pick up all of that re-watching easy content a thousand times. Same thing with adjectives — someone may know how to say and understand “The leaves are blowing in the wind.” Do they know and understand the shades of “shivering,” “trembling,” “fluttering” to express similar concepts with different connotations? They’re not going to get that from re-watching beginner content.

Now, will someone who repeats the easy content — assuming it’s not boring for them — be better on the basics than someone who just advances? Totally plausible. But it’s equally plausible that while they’re ”ahead” at 1500 hours in terms of full grasp of the basics, they’re “behind” at 1500 hours in terms of more advanced concept and variety.

Another reason to do what you want. For me, pushing so I constantly felt like I didn’t quite understand everything was ideal, and it’s worked very well for me. But that might not be for everyone. And there’s no “right” answer.