Yes, every toddler needs 24/7 supervision.
> and once they identify harming things
Some of those harming things are really bad, even life threatening.
> I strongly believe that toddlers need not so much supervision and more free time/will. It will help them to become more self-sufficient person in future.
I doubt any of this is true, and I worry for the safety of your child.
> and more free time/will.
When my daughter was a toddler, she didn't want to be alone, she wanted to be, and she still always wants to be with someone. I have never heard of a toddler that wants free time. More like parents want free time and don't get any. Children at that young age need a lot of attention, caring and love, they should not be alone, like ever only nowadays many parents are too busy staring at their phones to notice.