Just to confirm, am I reading the part about the text widget correctly?

As noted above, for previously existing Text widgets that had the auto-add paragraphs’ checkbox unchecked (and thus the filter instance prop set to false), the previous behavior of not doing wpautop will be maintained: only once the widgets are modified will any extraneous line breaks need to be removed.

As a lot of my sites do not use the check box for paragraph breaks, do I need to update every text widget I use, or is it only moving forward?