[konaraddi]

Speaking for myself : it's a bit creepy and unsettling. Using brain cells is probably inching closer to consciousness than today's silicon is, and consciousness isn't well understood so I'd fear this line of research could eventually lead to the "I have no mouth and I must scream" the other commenter referenced. Many decades from now we might be wondering how much of a human brain needs to be grown in a lab before it's considered unethical.

[lateforwork]

Is that an issue only because these neurons are biological (still artificial because they are lab grown)? Silicon neurons could also become more powerful and lead to the "I have no mouth and I must scream". In fact, top tech companies are investing 100s of billions of dollars they year to make their silicon neurons more powerful.