I guess the obvious question is whether something that mimics biology closer is actually useful. Computers are useful exactly because they aren't the same as us. LLMs are useful because they aren't the same as us. The goal is not to be as close to biology as possible, it's to be useful.
Neural networks have turned out to be pretty useful. The goal of distributed parallel processing wasn't to recreate the brain but to recreate it's capabilities.
If you could get biology, but:
* taking less than 18 years to produce a new chip
* able to task-switch instantly (being a doctor one minute and being a lawyer the next, scaling up/down instantly based on current workload)
* having millions of identical clones that people intuitively understand how to work with
* with no need for toilet breaks, sleep, family emergencies, holidays, weekends and all that
It would be pretty damn useful.