Because it looked a little meh. Sure, it's powerful, but in RP, we are going for looks over everything. Your's has just spammy guns all over the front and a yellow brick. If you look at all of our designs, there's lots of detail and shape.
A medium small sized destroyer used as mass infantry for carrying our medium - large assaults. Armed with 8 destroyer cannons on the side, and 8 turreted tank cannons at the deck. Also has 8 seeker torpedos for underwater submarine targetting and lastly, 8 repeaters for small boats. No shielding but plenty of armor.