[docs] Add some details about TextField vision

Following #7768 (comment)

docs/src/pages/demos/text-fields/text-fields.md

@@ -17,6 +17,10 @@ The `<TextField>` wrapper component is a complete form control including a label
 
 `TextField` is composed of smaller components (`FormControl`, `InputLabel`, `Input`, and `FormHelperText`) that you can leverage directly to significantly customize your form inputs.
 
+You might also have noticed that some native HTML input properties are missing from the `TextField` component.
+This is on purpose.
+The component takes care of the most used properties, then it's up to the user to use the underlying component shown in the following demo. Still, you can use `inputProps` (and `InputProps`, `InputLabelProps` properties) if you want to avoid some boilerplate.
+
 {{demo='pages/demos/text-fields/ComposedTextField.js'}}
 
 ## Layout