I suspect a lot of it would be the success of garage-based inventors, and the pure-R&D divisions in larger corporations (Xerox-PARC, HP Labs, etc.)

The former is likely harder to achieve now, much like how games development is now an affair involving large teams whereas games developed in the 1980s may have been single-person affairs. The act of making a computer and all related silicon is a much more complex affair, the last CPU design you could probably feasibly keep in your head may be the MC68000 .

The latter too is now still a thing, but much less open, and either rent-seeking through patent, or pure profit with lower tolerance for wild ideas (less risk tolerated for an obvious cost-centre).

Not the parent, but my thought is, and their comment seems to suggest, that the sheer density of exciting, new, and groundbreaking CS work is an absolutely energizing thing to read about.