The characters being typed into a TEB are being immediately written to the TEB's associated variable. Clicking the Submit button is not what updates the variable. It's being updated in real-time.
Clicking the TEB's Submit button is usually either about validating the entered text, or else executing an action to jump somewhere else.
When you have multiple TEBs you can turn off their individual Submit buttons and just have one normal button on the slide that executes a Conditional Action to validate the values in each TEB via the decision blocks in the conditional action. So this allows you to validate multiple TEBS with a single conditional action. There are still certain types of validation that conditional actions cannot perform (e.g. allow UPPERCASE, or allow lowercase, etc) and if this is required then you may be better off using the validation options that came in with 6.1 but were only debugged once you got to 7.0.1.