I'm guessing that probably what we're seeing here is simply a system that wasn't thoroughly ruggedized enough before being fielded. This wouldn't be the first time it happened, IIRC.
When "Schurzen" (spelling?) side skirts got slapped on WW2 era German armor as a bandaid against anti-tank rifle rounds smashing up their expensive equipment, shortly after fitting them they discovered that they were too easily bent, knocked off, damaged, or destroyed just by moving around through certain woodland areas etc that normally weren't a problem for tanks. I seem to recall that eventually the answer was a combination of improved attachment methods together with bending the ends of the plates in so they were more likely to make things slide along the outside than to allow them to get inside and scrape the plates right off the tank.
As for tanks and obsolete, IIRC, the pendulum swings both ways, it just goes one direction at a time. The latest generation of high end anti-tank weapons are obviously quite effective. I imagine that soon enough we'll start seeing 360 degree APS including those that protect against top attack munitions added, simply because there is a limit to how much armor you can pile on to your tanks if you still want them to move.
The Abrams is badly in need of something like that.
The Leopard 2 is badly in need of some similar upgrade programs. I would REALLY like to see the hull ammo storage thing being addressed sooner rather than later. Reconfigure with an internal bunker including blow-our panels for hull storage (if possible), or switch to something like the Challenger 2 system that will douse the rounds in water if hit, or change to individual armor plated tubes to try protecting the rounds from penetrations like some of the Merkavas do, really do something or pretty much anything to reduce the vulnerability. Whatever is lost in terms of total capacity can be addressed, if necessary, by adding an external stowage canister in the bustle rack to hold the left over rounds. Unlike the T-Tank designs where the ammo is pretty much always going to be strapped to the crew, I think the Leopard has enough room to come up with a little bit better solution.
EDIT TO ADD: A question about the "Relikt" soft packs. Are those things the only ERA covering the sides of those T-Tanks fitted with it in the bags like that? Or are they placing it over the top of the more usual Kontakt1/5 ERA that we would expect to see there? If the Relikt in the bags is the only ERA in that area I am really shocked that they allow them to deploy with something so fragile. If it was designed as an easily attached supplement, then I can understand how something like that might be acceptable. If you can get it to stay there, good, so much the better. If it falls off, you've still got your Kontakt 5.