Even the fast bullpup reloads have problems. For starters they're executed without gear/armor. Second, all participants have to look DOWN to execute the reload. This is a non issue for conventional rifles. How do you retrieve a fresh magazine with your support hand while simultaneously dumping your empty mag?? Oh right, you can't!! That alone will add time to the movement which is not experienced with several conventional rifles. Even the "rock and lock" rifles like the VZ can be reloaded by using the full magazine to eject the spent magazine. One motion for two actions. How do you shoot SBU with a magazine sticking out of the stock? How do you reload when prone?
TDC
The Tavor is a rifleman's rifle. It gives rifle length (not carbine) barrels in a very nice to handle rifle. Shoot one of these off hand in standing, sitting (I use legs crossed) and prone. This rifle balances beautifully without extra supports (web belt, mag carriers or the RCMP upside down baton trick). Shoot it at 100 plus yards. Then you'll see why this rifle is an improvement over the conventional design.
There's also the argument regarding the required barrel length and the velocity needed for the 5.56/.223 ammo to tumble on impact. Other's have gone into more detail regarding this issue than I can.
Fast mag changes are a distant second place to me compared to how the rifle balances and shoots. You can change mags fast enough for my purposes. I'll be looking for cover to do a mag change anyways regardless of which rifle. The improved balance and the shooters ability to hold the rifle on target easier is a huge plus. More accurate shots means less need to change mags due to misses.
How do you change the mags in prone etc? Easy you tilt the rifle. The same as with an AK, CZ etc. It's closer to your chest but not right in it. You can still do mag changes.
By the way you can't change a mag with a CZ/VZ 858/58 using another mag without the new after market modifications. The mag release is partially enclosed and difficult to get at. You're thinking of the Ak. A mag on the CZ doesn't fit into the mag release to activate it. There are new modifications available which allow you to, but they've only just come out as a commercial product. Up until now, they were owner mods only.
The bottom line. Shoot one of these offhand and you'll see what all the fuss is about.


















































