Before this devolves into a bunfight, we are speaking about hypothetical future capabilities here.
For accurate long range and semi indirect tank shooting, there are currently through tube missiles like LAHAT and various Russian offerings for their 125mm canons. The Korean Army has a guided top attack round for their K2 tank:
The KSTAM (Korean Smart Top-Attack Munition) is a fire-and-forget, top-attack anti-tank munition with an effective operating range of 2–8 km, developed specifically for use with the K2. It is launched as a kinetic energy projectile, fired from the main gun in a high trajectory profile comparable to that of a mortar. Upon reaching its designated target area, a parachute deploys, giving onboard millimeter band radar, IR and radiometer sensors time to seek and acquire stationary or moving targets. When a target is acquired, an explosively formed penetrator is fired from a top-down position, to exploit the weaker top armor of tanks. Target acquisition can also be directed manually by the tank crew via a remote-link. These characteristics allow the launch vehicle to remain concealed behind cover while firing successive rounds towards the known location of an enemy, or provide effective indirect fire support against targets hidden behind obstacles and structures.
And the US Army spent a lot of time and energy pioneering these techniques (Through Tube Missiles were invented in the 1960's for the Sheriden and M60A2 tanks, and TERM [Tank Extended Range Munition] was developed through the 1980's), although never widely adopted. There is a possibility of the US either redeveloping these sorts of rounds for themselves, or purchasing them from allies like Israel or Korea.
These sorts of munitions will become more common and cheaper as time progresses, and I can see Tanks or AFV's carrying rounds of this type in the future to provide more options for the crew commander and the combat team commander (with some sort of battlefield networking there is the possibility of getting every tank into the fight even if they cannot see the targets with their own sights usig these sorts of rounds).
For a hypothetical Hetzer II with a 105mm howitzer, the primary emphasis will be on HE or HESH to destroy hardened targets like bunkers and light AFV's, but a few smart rounds could add another arrow to the quivver if needed. A "Universal" platform might not have a cannon, but STRIX 120mm mortar rounds or top attack missiles like the TOW 2, Bofers BILL, SPIKE or Javelin ATGM (among others) provide accurate IF capability vs hard targets, and in the case of a mortar, the 120mm warhead will do a lot of damage to other targets as well. If the "Universal" platform includes a light tank (like the CV90120), then smart rounds increase the utility and survivability of these vehicles.
So long range indirect fire capabilities not only exist now, but can be markedly enhanced with smart ammunition.