Samsung can add edge features in galaxy A50...... Bcz its the speciality of samsung and they are been delaying it from 2 years .... first in one ui 2.0 they missed that and also in one ui 2.5 but they can give it in one ui 3.0 if they want 

Samsung can add the edge lightning and edge panel features in the mid range phones because edge features are specialty of samsung and optimize the features according to phones model