I believe spirits have advanced past that a very long time ago. I believe most humans are just “too immersed in this gross and physical reality” that they forgot to notice what’s right in front of them
Young ones(Usually below 5 years old) notice this orbs and forms all the time but the society, over time, re-programs and condition them to ignore what they see.
The society teaches them to be less aware of the subtle energies
You ever heard an instance when a child sees a Subtle form/spirit/form/energy and the child tells his/her parents - Mom, Dad! I saw a white dragon floating in the sky. Then the parents laugh at him/her and make the child think himself immature for seeing such
Another instance - This happened to a kid i know.
He saw a being with two heads and four horns and he ran away in fear to his parents. The parents laughed happily and told him it is a sin to lie and that he should stop lying.They thought he was making up stories. No one believed him except me.
Babies, at a very young age, recognize their parents mainly by using their Astral senses. You should notice that some kids/babies, on noticing someone with an Aura that scares or is strange to them - they begin to cry/move away from that person/frown at them/disallows the person to touch them.
I believe the reason why we couldn’t see them before is because our mind has been conditioned to “overlook” them.
They have been there all this while.
They are very much present like the physical objects we see.
We have just been made to believe they are things impossible to comprehend.