Earlier quoted context omitted.
This will change when we can spin up whole human bodies for experimentation and discard them at will. We need to clone decephalized humans. Turn off neural plate development. Downregulate genes that cause brain development. Before we get this right we can supplement it with surgical techniques to ensure the clones never have brains and never become sentient. Hook the embryos up to artificial life support that innerva…
What makes you think that (1) that it’s even possible to create such beings, (2) that these would even be good disease models or (3) a lack of model organisms is the main factor holding back medical breakthroughs? None of these is at all obvious...
2. We spend a lot of time "humanizing" model organisms by creating chimeras. But even then the results are frequently not portable. How many animal studies fail to make the jump to advanced clinical trials?
3. A human is the system you want to study. It has the same genome, the same transcriptome, the same proteome, the same metabolome, and the same kinetics and thermodynamics. Animal models are 17th century dentistry in comparison.