Especially, canvas would become useless in an opt-in scenario and would just foster permission fatigue (people just clicking "Allow" because it makes those dial

Especially, canvas would become useless in an opt-in scenario and would just foster permission fatigue (people just clicking "Allow" because it makes those dialogs go away). Another option might be to define closely (pixel-by-pixel) how a canvas should look like after a specific action. That way vendors would have less room for 'their way' of drawing things but the result would look equal and would be useless for fingerprinting. Similarly, one could define a list of fonts which every browser should bring and all other fonts should be loaded from a server. It would eliminate the 'you have special fonts installed' problem completely.