I definitely disagree with your "senior ref". As the Lead in a 2-person system, you should generally start off about halfway between the lane line and the 3-point line. If the ball comes in the 3-point area on your side, you can either open up to the play (turn your shoulders parallel with the endline) or move even closer to the sideline.
As the ball moves to the other side of the court, you should move closer to the lane, roughly a step or two outside the lane. If/when the ball comes into the post on the opposite side of the lane, you should move across the lane and officiate "ball-side". You'll have a better look at the matchup on the far block if you get over to that side of the lane.
This is the "A-B-C" positioning for 2-person. "A" is the wide starting position; "B" is the "close down" position near the lane line; "C" is the ball-side position.
Having said all that, there are gyms where you can't use that kind of positioning. If there's no room on the endline, you may have to stay wide simply because you're too close to the players to move along the endline. If that's the situation you were talking about, then maybe your senior ref had a point. But in most gyms, you have at least a few feet of depth on the endline and you can position yourself according to where the ball and the action are.
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