All the Bullpups you mention are best run on reduced power ammo according to the user armies.
I am pretty sure it is less being Bullpup and more being a piston driven rifle using a Stoner bolt but what do I know.
Famas is really kind of neat for 5 minutes, after that you realize it is an evolutionary dead end. Unless you like your optic mounted 6 inches over your bore.
It is the operating system - not the bullpup design itself. M16 familiy seems to like to run on higher port pressure, probably because the gas needs to travel 7 inches and the amount of energy required to move the system is different.
Most Europeans rifles were optimized for the requirements ( like SG55X)for that period. When the silly army or the "committee" want an ambidixious charging handle, there are only so many ways of accomplishing it. When the silly army and "committee" wants to shoot 300m bullseye, they optimize the rifle to shoot bullseye with iron sight.
Personally I won't mind a bullpup. They have a place in a big army and they tend to provide better balance with grenade launcher attached. If you think about it, most of the army work is about getting from point A to point B. If you cannot get there, you cannot use your weapons. It is definitely easier to rappel, climb walls, jump off helicopter/plane and ride in vehicles with a bullpup. And really, most of the conventioanl army does not even have enough time to be super proficient with shooting, so left/right shoulder switch and the X second gain in mag change/IA can be left to some more high speed specialists.
For a regular joe humping the rifles (or sportsmen that range shoots or hunts), I will say the benefit of a bullpup outweights the disadvantage. Unless you are a very proficient "gun guy" or your trade involves shooting stuff against the timer, then bullpup is too much a generalist for your application.
The problem with all the current bullpups is that they were designed and pushed out in the 70's and 80's. And in case you have not figured out most of these products were NOT designed to compete in an open market, but rather around the doctrine of a specific military at "that time". They were certainly way ahead of their time back in the 70's and 80's(so were Ramones and Rancid I guess...). Even for the TAVOR(and G36), it is designed such that IWI and its affiliated israeis companies will own the accessories sale, and hence all the proprietry mounting points on the TAVOR. It was super awesome on paper to integrate all these gadgets in one package (and lock you into buying their accessories) back in the 90's. However, it also limits yourself to the innovation elsewhere. Of course, if you do not have your own budget to buy stuff, it does not mean much and you do it with whatever you have. IF you do have a budget that you can control, you probably will just go buy M4s because you don't have to ask the central planning committee before you buy the add-on gadgets. For 99% of the population and many of the budget minded militaries, giving everyone an IR laser(well, they need to issue NVG to everyone first right?), mini range finder or super duper flashlight is not happening soon - so many could be happily served by whatever proprietary system and keep driving on for quite a while.
On the other hand, the AR15/M16 is born and has evolved in the biggest free competitve firearms market. Also,the US government does not just hand the firearm contract to one local company as if a private company is the state arsenal ( like HK to Germany, FN to Belgium, Diemaco to Canada or Berretta to Italy)