IBSA decided that Israel had no significance for future fulfillment of Bible prophecy when Russell took a group to Jerusalem around 1913 (I may be a year off) and found that the Jews were disinterested in his message. They were not going to convert en masse. Just a few years ago, Watchtower dabbled with the same idea and again decided that the Jews in Israel were even less enthused about the message that Watchtower delivered.
The Bible is clear that the "center of the earth" is Israel - whether you subscribe to it's message or not. WTC refuses to relinquish the role that they believe they have as being at the center of all prophecies. This tainted narcissistic narrative influences everything they do and teach. When they refer to Jerusalem, it is never in relation to the future, just the past.