Let's review some awesome charts comparing Zcash and Monero to review why privacy implementation matters.
Proportional sum of Monero and Zcash transactions that hide the sender, receiver, and amount
https://pbs.twimg.com/media/En4oKylXYAA7_Sa?format=png&name=large
Monthly Zcash and Monero transactions that hide the sender, receiver, and amount
https://pbs.twimg.com/media/En4qy4oWMAAu7Fa?format=png&name=large
And just for fun (since a certain company seems to love cumulative charts for some reason):
Cumulative sum to date of Zcash and Monero transactions that hide the sender, receiver, and amount
https://pbs.twimg.com/media/En4s13aXUAAkj1V?format=png&name=large
What other charts do you want to see? Any feedback or questions?
Implementation matters. Mistakes left lingering have ever-growing negative effects.
Dr. Sarang Noether (Monero older data)
CoinMetrics (Monero newer data)
Gareth Davies (Zcash data)