As much as I like your idea about the penalties, they is so much subjectiveness as it is, it will just lead to more bad calls.

As a neutral, neither Fulham pens looked a pen, if it was given for Arsenal I’d think those are fortunate and lucky calls.

And the second wasn’t given on field, they isn’t clear and obvious error, if the first isn’t over ruled neither should the second.

Lack of consistency within one game is shocking.

The ref isn’t to blame in any of this, it’s all on the stupid VAR.