The reason is to avoid situations like "attacked a group of giants (they fall apart after 2 weeks, regardless of the castle), and half of them are titans." Reducing the role of uncontrollable randomness.

It's clear that slowing down and outshooting a bunch of clumsy pillars is not difficult and is quite enjoyable :) Again, there's no excitement. If we're talking about poker, even when you raise with AA, there's still something happening. Some idiot with 44 sets on the river – and it's pointless to get angry at him.

Firstly, if really needed, you can check for GS (Game State).
Secondly, if half of them are titans, it means we took too many troops against them and need to take fewer, so they form 7 stacks.