The video covers the history of the hard disk from the very origins, and goes over the boom cycle when there were dozens of hard disk manufacturers innovating and competing (and the established disk manufacturers combined only had single-digit market share vs startups. Now there are only 4 disk manufacturers, total). Adding a few TB every couple years is far from the innovative cycle during the "boom" the video is talking about.

Great, congratulations. Now figure out how to use the tech without increasing per TB costs and find financing for that with large enough ROI so that the capital that be cares. Seagate already ships 24G HDDs at 20 Euro/TB, whether you want to call a step up to 30 "drastic" I'll leave up to you.

Meanwhile, current NAND chips aren't using EUV. The industry can piggyback off the investment and experience of logic chip manufacturers, HDD manufacturers can't. Synergy and all that.