Not necessarily alternative but I saw that for example Google seems to be trying to reinvent the wheel with emailing and calendar, introducing features like "Sn

Not necessarily alternative but I saw that for example Google seems to be trying to reinvent the wheel with emailing and calendar, introducing features like "Snooze", "Reminders", or "Goals". I am wondering how useful or widely used this features are or whether traditional approaches to email and calendar are just fine and sufficient.