Only useful against large techs while using minimal weapon count, as different weapons have different velocities, meaning they won't all go to the same place. Then there is the question of the built in inaccuracy of the guns.
I think aiming is very 1940's, hear me out, back then tanks and planes have conventional guns and bombs without any targeting systems, so their effectiveness is up to the gunner/pilot.
However, pushing to early 21st century we see more and more military around the world adopting the 'first look, first shot, first kill' doctrine. This means that weapons system will detect hostiles long before the operator can see them, thus rendering 'aiming' obsolete (heck, even modern artillery are relying heavily on targeting systems nowadays). Instead, the race is still on concerning who can detect hostiles first, and to my mind this is the smarter approach, rather than making a manual aim feature, TT will benefit from longer radar range, and stealth mechanics (where your tech can disappear from radar, or unable to be targeted altogether)