I know a lot people are concerning about the 12 unit selection. I have a naive idea recently.
The traditional 12 unit selection is not easy to remove. Even if the selection limit does not influence the balance design a lot, unlike the case in starcraft (zerg will be much stronger with F2A), selection of large number of units requires the redesign of the path finding and moving strategy, which highly influence the control feeling. For instance, in the old games that allow unlimited selection, like age of empire, all the selected units are group to 1 team with the lowest speed in the group, and move together to keep the team. Another modern example is starcraft 2, which force the same units to gather together, and then different units move according to their own speed. I donât think most of players want that the control feeling of warcraft changes such much to starcraft2 or AoE2. Therefore, one cannot just consider the selection problem without changing the game mechanics that are the core design of warcraft.
However, warcraft has another mode which I never see any people use it, i.e. auto-formation with alt+F. After auto-formation, all selected units move together with the lowest speed, similar to the case of AoE2 that allow player to select all units. I think in this mode, selecting 12, 24, 36, 48 units together are fully allowable. In the real esports match, nobody will use it, even if it allows to select all units together. As for game mechanics, nothing needs to be changed for path finding or moving strategy, since the auto-formation has already been there in the game.
In sum, allowing auto-formation to select all units helps noob player to enjoy 4v4 or other unprofessional games, while the real ladder games wonât be changed anyway.