You know, I usually answer this kind of question by saying, "observe and paid attention in how I do it. And after that it's your turn to try" or something along that line.
In theory yes bullpup design look more advantageous due to their barrel length in more compact overall package. However, in practice a service rifle or sidearm is an extension of your body. And for all-purpose & intent should be considered as part of your body. Which mean to reach a sufficient proficiency with any weapon, you need good muscle memory, meaning your hands & arm already know what parts of the weapons you touch without looking at it. Any proficient shooter / operator would also know how much ammo left in the magazine simply by holding the gun. All those are about muscle memory.
Back to bullpup design. All our soldiers were trained from the start using a conventional weapon. And that mean muscle memory is already stuck to conventional design. To change into bullpup would require to "unlearn" half of what already been learned. Not only that took time (and money for the training ammo) but when changing back from bullpup to conventional can't be done instantly as far as proficiency count.
As for bullpup design itself, shooting with bullpup mean the weapon action is on your face literally speaking, while on conventional design there is the stock that put some distance between your head (read : face) from the mechanical action of the gun.
Now I'm guessing you now thinking as "Why not training with bullpup from the start" right? The problem is, most rifle (battle rifle, long range rifle) are in conventional design (technical & practically reason). And the last thing any military want is for the men to "unlearn" what has been taught from the start just to take a speciality role. And that is the main reason why there are only few countries that equipping their soldier with bullpup.
In the end It doesn't matter what brand or type of weapon you use, they basically just a tool, what really count is the man behind the gun.
Not even the Israeli had favorable impression toward their excellent Made Tavor, and instead more to like to use their AR 15 families more with all of their faulties in the battlefield.
The bold part
Btw, the same thing can be said against our little brother Singapore, they are come from convenient places, always trained in restricted condition and never being put on the frontline parts with all of fog of war ascertain that. More than that, surely they cannot afford to do big style battle with big casualties like proper normal big countries. Not even they can reach determination like what Israeli had considering much of their Armed Forces population is come from certain ethnic background. Thus even though currently they have more technology edge and style they are never being in our threat perception and convenient choice as Indonesia natural allies in the region.
Btw let's take a pray for all of accident victims recently