Westerners tend to be too Western-centric, looking mostly at what Europeans, North Americans, Israelis and to a lesser extent what the antagonists in Russia and mainland China produce as weapon systems.
There sure is more being written about the American taxpayer-rip off rackets (FCS, GCV) and the German IFV Puma than for example the South Korean K21 infantry fighting vehicle.
I wrote before about my scepticism about the IFV concept in general (1, 2), but this aside I'll have a look at the K21.
It sure does have a less unreasonable weapons layout and ammunition range than the Puma (which is really the limbo benchmark in this regard).
It goes against the trend and insists on amphibiousness - a characteristic which was given up during the 70's and 80's in many AFV programs because weight gains for additional protection, weapons and other equipment made amphibiousness impractical. The use of internal inflatable 'air bags'/pontoons for additional buoyancy may actually provide some extra protection: Rubber is a reactive material and quite weight-efficient as a defence against shaped charges' penetrating tips and the extra angling and spacing of the outer plate may add a lot to its protective value both against chemical and kinetic energy attacks. The system would need to use multiple isolated chambers, of course - or else a single AK bullet or sharp underwater obstacle could deflate one side. The safety of amphibious operation already requires such compartmentalization, though.
The quantity of mounted smoke dischargers is small as usually (I think too small), not reloadable from behind armour (a usual deficiency) and apparently not bulletproofed (this is going out of fashion, as bulletproofed discharger sets are becoming more common). They may also require extra attention when camouflage (nets, foliage) or add-on armour (ERA, NERA, cage) is applied, which wouldn't be so troublesome if they were mounted behind the turret, overshooting the turret (a still very rare location).
The front plate (trim vane) is apparently meant not only as bumper and helping critically during swimming (turned up), but also as spaced armour and probably of high hardness to help the poorly angled part of the front against 30mm shots.
The sights and sensors are probably a weak spot of this design, as known from so many others. Normal glass is not transparent to infrared wavelengths; that's why you can see with a thermal camera how much warmth escapes from a poorly insulated house through old-fashioned windows. You don't see the IR radiation that goes through windows, but rather the one emitted by the warmed-up windows. You need a special, rare kind of glass in front of a thermal (IR) sensor.
This in turn means that thermal sensors are natural magnets for bullets. You cannot use them much once they were shot out, so this is a major issue (comparable to the M1 Abrams deficiency revealed in Iraq; unprotected bore evacuators).
Such sights should not be vulnerable to bullets from many angles from beyond their own field of view. One of the K21's has a cover plate to protect it at times, but it's apparently still vulnerable from beyond its FOV when in use.
The primitive turret roof hatches are another weak spot. We've seen better designs for generations.
The official protection rating is strange. 30 mm APDS is hardly a relevant threat; the Russian 2A42 30 mm autocannon can fire more powerful APFSDS and both 23 mm AP-I and 67-85 mm HEAT warheads are much more common, much more troublesome threats. One shouldn't believe published figures, of course.
Quite notable is the use of a glass-fibre composite hull (first experiments with this during the 80's); this would no doubt be hyped up a lot as hyper modern leap-forward transformational if the K21 was American.
Some photos show external, possibly bulletproof, boxes instead of cage-like containers for rucksacks. This may be considered very important by the crews during weeks of campaigning, as unprotected individual items can easily be ruined by bullets and fragments.
Some components are identical to what the new South Korean MBT (K2) uses, which is a nice-to-have feature.
Remarkably, the dismount strength of nine men (of to me unknown size restrictions) is rather fine, albeit the presence of a missile armament may lead to a reduction to eight in practice (especially if the missiles are used as general direct fire support).
The most remarkable fact about the K21 is a different one, of course: It is a new tracked armoured fighting vehicle in production. That's rare in Western or Western-friendly countries nowadays.