Your little caption there sorta sucks! It should say One Person's Post should tell more than 10 qualities!
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PEKKA LV5
25 space - 380 DPS (15.2/1 space) - 4500 HP (180/1 space) * can't attack air, can't skip walls.
DRAGON LV5
20 space - 220 DPS (11/1 space) - 2700 HP (135/1 space) * BUT can attack BOTH air and ground, do splash damage, and skip walls.
BALLON LV6
5 space - 162 DPS (***32.4/1 space) - 545 HP (109/1 space) *** can't attack air BUT **splash damage** and **defense priority target** and skip walls.
You see how powerful balloons are relative to the space required. It has twice the DPS of PEKKA per unit (and 3 times the dragon), target defense first, do splash damage, and skip walls (not to mention damage output when shot down).
THAT'S WHY it's freaking slow. Balance. It's not stupid. It's actually quite well thought out really.
It's so haste has a purpose.
IDK, why are goblins so fast?
Basically, balancing - or the troop becomes too OP, or too underpowered(UP).