I’d like to make a few points:
1. This is an age-old discussion. The gemara of “oker harim” and “sinai” implies that both methods are valid.
2. One can make the case that a “sinai” in the days of abundant seforim and electronic resources – while remaining important – is less so.
3. The modern day yeshivos (for good reason) focus on making learning fun (read: “geshmak”). The sources above are seemingly focused on the objectively best method to acquire genuine torah knowledge. They may agree that an “eis la’asos laShem” type mentality applies nowadays.
4. Generally, quantity vs. quality is always a legitimate discussion. Both are necessary. Either one when taken to an extreme is silly.
5. One can acquire, review, and retain plenty of new information within an iyun-type seder, showing that the two ideas have vague boundaries.