I think it all comes down to the final result. In absolute terms the 20M of the RX100M7 produces an identical or almost identical image than the 50 or 200M of the X100U not to mention digital processing to balance all this out.
Technically speaking, Vivo/Oppo/Huawei could only use about 65% of 1" sensor area to capture light due to physical of the phone. If you want to have great memory pictures then use either full frame or point and shoot cameras. Phone camera is only for convenient usage so far.