I don't know....but for me is perfect and feels super nice, if you want more intensity you can go to settings- sound and vibration-select vibration intensity and the 3rd option is touch interaction, there you can maximize the vibration of the Samssung Keyboard.
Hello @Below_Me ,
Thank you for your post. We will pass on your feedback to our usability team and request to see if they can match vibration levels provided by GBoard with out losing current lowest vibration setting.
One UI Beta Team