Chamber would be useless, both tps need their advantages and disadvantages. Chamber's advantage is that is fast and can be used at any moment, the disadvantage is that it's static, can't reach that far, and sometimes is not that flexible. Yoru's advantage is that is it can travel across the map, can and does not need to be set up beforehand, the disadvantage is that it can not be used like a jail free card like you can use reyna's dismiss and Jett's dash and it has a time limit. Dunno about the ult, I think is fine