Regardless camping happens no matter what. I've played year 1 trials with radar and then I've played the no radar version now. Both still have campers. I could go on and on about the benefits of a no radar trials but to cut it short as you said, more flanking is possible cuz people don't have a radar to give it away, instead if you want to stop flankers you have to actually be self aware and use team communication far more to call out the enemy position. I also see a no radar mode actually limiting camping. Why? Cuz if I can't see my opponent by radar how will I know to camp a doorway? Where as if I have radar I can see red in the screen and sit on the side of a door. It then creates snowballing when both opponents know each other are on the other side so they back off and wait it out, where as with no radar you simply go with your instinct and you are either rewarded for it or punished for it. Really camping is just a bullshit excuse for those using it, and even then, the positives of no radar outweigh the negatives.