“Tech I’m skeptical of and why” by harsimony

I’m a fan of people trying things, even if they seem silly. Dismissing risky ideas misses the point of research. But thoughtful criticism can direct effort to more promising fields. To that end, I’m going to try to make my criticism as constructive as possible, with concrete reasons for my pessimism and closely related research areas which are promising (and stand to benefit even from failures in the field I’m criticizing). Not every section will live up to that standard; some arguments are built on vibes alone. I might be wrong, so I still want to see people work on these problems. Preliminaries Exhaustible resources more expensive long-term The theory of exhaustible resources suggests that “the real price of an exhaustible resource should grow at a rate equal to the real interest rate.” The data are consistent with this hypothesis[1]. Innovations in search and extraction can dramatically lower prices in the short term, but in the long term, we converge on a correct way to do things. Once extraction is solved, prices return to their slow upward climb. Idiot index Raw materials are just a fraction of the final cost of a good. You need to take out loans [...] ---Outline:(00:46) Preliminaries(00:49) Exhaustible resources more expensive long-term(01:19) Idiot index(02:58) BOTEC's are inherently optimistic(03:35) e-Fuels(05:28) Launch costs below $100/kg to LEO(09:06) Asteroid mining(11:35) Space data centers(12:45) Chips(14:19) Cooling(18:49) Energy(21:58) Communications(23:36) Permitting(24:19) A better way(26:02) So ... space AI?(26:47) Space doesn't need to be profitable(28:28) Ramjets and demand for Mach 3+ flight(29:50) Passenger rail(30:46) Fusion(35:12) Non-solar energy sources(37:35) Quantum computing(39:10) Gene therapies in humans(40:20) Brain-Computer Interfaces for healthy adults(41:08) "Nanotech"(43:42) "New materials"(43:46) Structural materials(45:46) Electrical materials(46:19) Optical materials(47:08) Catalysts(48:07) So ... new materials?(48:34) Economics of home robots(49:55) Conclusion The original text contained 35 footnotes which were omitted from this narration. --- First published: June 1st, 2026 Source: https://www.lesswrong.com/posts/Y5cQYKYwAb2WwXXQQ/tech-i-m-skeptical-of-and-why --- Narrated by TYPE III AUDIO. ---Images from the article:Apple Podcasts and Spotify do not show images in the episode description. Try Pocket Casts, or another podcast app.