[peshkira]

In my opinion these two points only hold if you work alone.

As I see it, you don't estimate for yourself, you estimate for transparency, so that other team members can plan accordingly.

In your first point, you might not be able to estimate, but others might be able to do so and give you hints. Your final estimation might still be off, but that's how you learn.

In your second point, you estimate so that others can see how long it will take and plan their work better.