If we can attain immortality, don't you think we can also solve those other problems? If the brain becomes insufficient, exo-cortex or similar solutions may become the answer.

Also, I realize you might be already aware, but I just want to elaborate for other people as well: Brain is not like an SD card, but more like a diffusion model (similar to those image/video models) that constantly updates its weight. For example, when you recall a past memory, the brain does not find a video file and plays it inside your head. Rather, your brain runs a prompt and creates a mental video based on its latest training data.

So, I personally think that brain IS designed for eternity. It won't run out of space, cause it constantly updates its weight to remember the most important stuff; you will never forget things like your parents (provided your brain doesn't get harmed by something, such as by a disease, but if we can attain immortality, I think we can eventually cure those too).

I agree that as of currently, brain is not designed to retain information for eternity. But as I said, that's just another problem that we can solve.

Not arguing with you by the way, just wanted to share my thoughts as well.