First off i mainly play a more scout role in game so this mostly effects me and other scouts.
So before they changed the enemy icons (the icons that now show the weight class of the enemy mech) there used to be either a filled in red triangle or an empty one. If the triangle was filled in this ment that either you or a teammate was targeting it. Which meant that everyone on your team could see them (both on hud and on minimap) because they were sending that targeting data to the team. If it was an empty triangle that ment that only you could see them and no one was targeting them. Fairly simple to understand and more or less straight forward.
However....Since they got rid of that and now it just shows the weight class symbol, there is no way of knowing if only you can see them or the whole team can. This is doubly annoying because as a scout i need to know if my team can see an enemy on my screen or if its just me. I do not help the team by targeting someone that everyone already sees. Because im not giving my team any new info.