OnePlus explains the lack of water resistance of the 7

An accompanying video also claimed that the water resistance indices "cost you money" and showed that a OnePlus 7 model was plunged into a bucket as "proof" of its ability to survive immersion.

Pei did not rule out IP classifications in the future and did not want customers to try to overwhelm their own phones.

Whether that persuades or not someone is another story. It does not necessarily cost the Buyer the money needed to get an IP ranking – it's up to the company to decide the impact of that cost on profits. And IP ratings can be especially important if you are outdoorsy. They let you know quickly if a phone will survive your trips and help you make informed purchases. Although the lack of IP address does not necessarily mean that a phone is fragile, it will not be very reassuring.