An email filter should be created when you will:

Creating an email filter is particularly useful for scenarios where you will never need to see a certain type of email. This allows you to automate the management of your inbox by directing these unwanted emails away from your primary view, helping to minimize distractions and maintain focus on more important messages.

For instance, if you determine that specific newsletters, promotional emails, or notifications are not relevant to you, setting up a filter ensures these messages are automatically sorted into designated folders or marked as read, which streamlines your email management process.

While regularly receiving coupon or junk emails could also warrant a filter, it doesn’t necessarily indicate that those emails are entirely unwanted. You might still want to view some of them occasionally. Similarly, working only during specific hours does not directly call for the creation of a filter since filters are typically set based on content criteria rather than timing. Lastly, dealing with pointless emails suggests irritation but does not encompass the same broader sense of avoidance indicated by "never need to see." Hence, filtering out emails that aren't applicable or helpful is most effectively satisfied by the first option.