Well actually you can (see [bind()](https://github.com/joomla/jissues/blob/c857cc1429ca42fdd42403b8e3b37dad56198349/src/JTracker/Database/AbstractDatabaseTable.php#L191) ;)
It's more that this [add()](https://github.com/joomla/jissues/blob/c857cc1429ca42fdd42403b8e3b37dad56198349/src/App/Tracker/Model/IssueModel.php#L212) method only accepts arrays ;)