From a support point of view it also makes sense to enable all scripts on a website temporarily, since there are websites that run scripts from y) and also require scripts from z) to function properly.
Less anonymity issues, less support issues. Maybe easier to handle by users.
Arguably one can say that it is dangerous to run all scripts a website would like. Arguably one can say that not all scripts are required.
Since this are valid statements you can (re-)enable the entries you want.
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