So far, OnePlus hasn't adopted certain features like wireless charging, nor has it obtained an official "IP" water-resistance rating.
For wireless charging, the company said it didn't get enough feedback from its community to add the feature.
And as for obtaining an official IP rating, it costs money get the certification, which the company chooses not to invest in. As a result, it can pass down the savings to its customers, too. Still, the company says its phones are resistant to splashes and light water contact.
Whether or not these features matter enough is totally up to you. And if they do matter, I'd also consider the extra few hundred dollars you'd be spending on other Android devices to have access to those features.