When entering text, sometimes we modify settings in the Character panel.
For example, to type CO2 (carbon dioxide) correctly, we select the '2' and enable "Subscript" on it.
What is very annoying is that this custom setting ("Subscript" in above example) remains enabled the next time we enter some completely different text elsewhere and we always have to go back and first fix the setting in the Character panel.

Feature suggestion:
Changes made to the "Character panel" should automatically reset to "default" once the text block editing is completed (or before starting editing some new text elsewhere).