OnePlus had its special event outside CES 2020, where it introduced the Concept One smartphone, with the cameras missing. The Verge managed to sit OnePlus CEO Pete Lau for his podcast, where he was asked what he thought about the recent trend of folding phones. However, Lau's opinion was that the company had investigated him, but found that the inconveniences far outweighed the professionals, so he has not pursued him. The interview was transcribed by Lau's interpreter, Eric Gass.
Following some of the excerpts from the interview with Verge, one of the reasons why Lau and his team have not chosen this category of smartphones, is due to the way the current screen is folded, which does not leave a look very "clean or crispy" crease. He claims that this also leads to wrinkles and screen problems and is not something I would like in a OnePlus brand phone. This sentiment also hints at the fact that we probably won't see a foldable phone from the company in the short term, probably not even a concept.
When asked about Motorola's implementation of the Razr, where the screen moves a little when folded to prevent wrinkles, Lau still didn't seem impressed with that. He mentions that, since the screen is still plastic, it will not have the scratch-resistant or durable properties of real glass.
If you think about it, it makes sense why a company like OnePlus would not focus on such technology, simply because it is not mature enough and probably does not want to devote a good portion of its R&D resources to a niche segment right now. There is no doubt that folding screens will improve and the costs of making them will eventually decrease, but at this time, it is mainly experimental technology. Giants like Motorola, Samsung and Huawei probably have the budgets to devote time and resources to experiment with new concepts, but that doesn't mean everyone can do it.