It has to do with the 100 player server, orinially there only were 64 player servers, but they say modded that to 100.
But now only 64 players get nametags shown i believe, the rest wont get any, so the aiming thing isnt bulltetproof.
Anyways just try to accustome yourself to look at the friendly positions on the map more, better to get into cover check map, than stand somewhere staring a someone for seconds.
If you assault flags shooting from to far isnt advisable anyways, you ll just alert the enemy and if you re far away enough they ll have respawned by the time you get into cap.