That’s really interesting! The ending is famous and otherwise well regarded, so the director probably made a good decision - even though I will always disagree :)
The ending of se7en makes no sense. All the previous victims were murdered because they suffered from one of the seven deadly sins (gluttony, sloth, greed, lust, pride). But the final two victims - that supposedly would complete the list - did not suffer from these sins, but instead the perpetrators murdered them out of envy and wrath. Gwyneth did not suffer from envy, and Brad did not get murdered for his wrath.
Such a shame because the rest of the movie is great.