@tnx While the Flic team has explained how this is by design, if you have a specific use that requires a button on the hub give you feedback on your phone, such as a sound, I can suggest a third party app such as Pushover.
It’s somewhat technical, but once everything is setup, you can create a URL that is launched in the background by the Flic hub (Internet Request) which then generates a popup on your iPhone. The sound, priority, message, and icon for this popup can be customized for each button if desired.
And, if a friend or family member will install the Pushover app on their phone, you can use your buttons to send notifications to them too.
Pushover is a small $5 one-time fee per device with a 30-day free trial. It’s been immensely valuable for me.