Bull-Pup does not give you any extra advantage except look fancy.
World top Armies still prefers conventional assault rifles.
M16, AK-74, FN-SCAR etc.
They use conventional rifles because of the ease training troops with ar type or ak type weapons plus there are a lot of parts accesories available for ar type and ak type rifles not because they have major operational advantages ,Israel which has been constantly in combat has recognised the advantages the bullpup offers.
The following are the advantages or bullpups esp tavor:
1.Overall length shorter but longer barrel length,higher muzzle velocity(which eminimizes significanty the lethality problems of 5.56),very usefull in urban and CQB situations which constitute a majority of the engagements, a huge advantage.
2.lighter and thus easier to use, less fatigue.
2.The weight is to the rear and thus easier to manuver.
3.The tavor especially is very easy to strip by removing a single pin and the parts are simple , not tiny and many.
Disadvantages:
1.The trigger is in front of the bolt assembly which means a mechanism is required to convey the trigger pull to the bolt assembly, this is slightly complex but solutions are available with steyr aug and tavor.
2.Slightly higher recoil impulse because the barrel end and mechanism are much closer to the shoulder.
3.Limitation in rail lengths 12,3,6,9 o clock positions to mount accesories.
4.Gases from the breech irritating the eyes and nose,as it is closer to the face.
5.UGBL mounting is slightly difficult because of the short lower rails or handguards, so all rail mounted grnade launchers cannot be mounted readily.
6.Absence of adjustable stocks and adjustable cheek rests.
7.Slightly akward to use in prone positions but many aknowledge it is not much of a hindrance.
Though there are disadvantages in the bullpup the advantages it brings to the table far outweighs the disadvantages which are not major problems.