True. Xenon can deliver way more light and in the process over expose the closest object and leave the background almost completely without the details.
Every built in flash on any camera is equally crappy and useless as those on the phones. The same goes for a very bright sunny day. To much light is almost as bad as not enough light.
Bigger sensors with bigger pixels on the other hand do wonders. Add a tripod and long exposure and than we have something.
Every sensor in every phone is simply phisically not big enough for some quality photos. Taking pictures when there's not enough light is one problem. The other one is the perception of the whole scene. It's OK when taking pictures of something close but in any other case picture always look "flat".