I think getting a quorum on this topic will be impractical and in turn letting each person pick which combination of add-ons they want themselves is going to remain the preferred method.
Each time you increase security and/or privacy you decrease convenience and different people have different use cases and in turn different acceptable levels of inconvenience.
I know some every intelligent people who would not want this functionality baked into the browser precisely because of the inconvenience it would create for their normal usage and they would rather maintain the default of convenience than transition to a default of inconvenience.
I’m not saying one approach is better/worse than the other. I’m just saying there are multiple angles to look at this from and there is no one size fits all solution.