Slack has introduced a new WYSIWYG text input feature, which has been met with criticism from users who prefer the old Markdown input method. The new feature has been found to have several issues, including problems with formatting code and inserting text at the beginning of a code span. Users are calling for the option to disable the WYSIWYG feature and revert to the old Markdown input method. Slack has since added an option to disable the WYSIWYG feature in the browser version, but it is not available on the mobile app.