@herlas - suppose from a hardware and software perspective they can do more.
saying that my phone notifies me via vibration and notification tone for all notifications unless I turn them off, put DND, and or switch to a vibrate/silent notification.
Your watch is effectively the same - you don’t want it to notify for an apps notification - turn it off for that app.
You don’t want to receive any vibration (notification sound if you have a speaker which the S7 doesn’t) then put DND on (note you can also adjust DND like you can for your phone).
You can also go into the apps notifications settings (on the watch) and adjust those if they have any built in - go and take a look at the options for google play store on watch (loads of different notification options - can tweak which notifications you receive) however some like messages - its on or off.
So really bit like your phone - really depends what the dev has built into their app as to how your can adjust.
You could try changing your notification previews to off - not sure if that changes whether it vibrates or not.