The Camera Module is very bumpy and it causes a lot of Table Wobble. This is very disturbing when you put your phone on a flat surface and try to type or do anything on the phone.
The OnePlus Open has an IPX4 Rating which I think can be improved because, at the same price, the Samsung Galaxy Z Fold 5 offers an IPX8 completely water-resistant rating.
Even OnePlus Open is a flagship smartphone the company hasn't given Wireless Charging support, which should be there at ₹1,39,999 of premium pricing.
OnePlus Open have very good camera hardware like 40MP Sony LYT-T808 main, 64MP OV64B 3X Telephoto, and 48MP Sony IMX681 sensors but the details are on softer side and there are so many inconsistencies in low light and portrait shorts.
OnePlus has given 32MP sensor on cover display and 20MP sensor on main display but they are not capturing a good quality pictures. I would suggest to capturing selfies using main rear cameras.