Simple Edit Text

i really don’t understand why this is not implemented.
I think it’s the base of all the form interface where you can change text or label things.

I really would like to have a simple Edit Text Field that you can change dinamically.
Right now if you want to show the result of a calculation somewhere you need to create a text field but in the frontend results always like a precompiled textfied that you can’t modify.
I would like to be able to use edit Text like in programming.

Thank you