Most people with COVID even with few symptoms have a loss of smell. If you like numbers, I read that around 80% of people with COVID report loss of smell.

And this is one kind of neurological effect. This is a more global view of how the virus could affect the brain:

https://www.scientificamerican.com/article/what-we-know-so-f...

And I'm not even touching the subjects of damage to the heart, clotting problems, etc.

The loss of smell is thought to be sensory, not due to affecting the brain.

However, those covid-induced strokes definitely affect the brain.

Yes you're right indeed, the Scientific American article even mentions what you say.

Nobody had it long enough ago to answer that. SARS-CoV-1 (1) patients have suffered years afterwards, see e.g. this article from 2010:

https://www.thestar.com/life/health_wellness/2010/09/02/sars...

SARS was 20 times as deadly as Covid.