Shoot a Tavor before you complain about the weight. A 10 pound Tavor feels lighter and easier to shoulder for long periods of time than a 8 pound AR-15. The weight bias of the Tavor is towards the rear whereas the weight bias of the AR is towards the front. ARs are very frequently nose heavy. The balance of a rifle is more important than the overall weight.
Name 3 modern*, military pattern firearms that have been adopted outside the country of origin.
Most of the designs we can get date to the cold war or just after and were designed for conscript troops with minimal training.
BSW
*Post break up of the Soviet Union.
No AR can match a bullpup for short overall length without sacrificing ballistic performance.
Another nail in coffin of Tavor
No. Basic AR can be bought for $600-$700 so I see no reason to throw away $1300 to $1400. Another nail in coffin of Tavor is I can pick something truly useful like Springfield M1A 7,62x51 Carbine for less.