2 types of beasts (excluding compounds for reasons)
1 type removed from beta, 1 remodel not implemented in game (if you know where to look), all pierce bosses are located in first half of game where end gamers are less likely to play. Gorgos stole wolver home tracking attack, literally one of the most lethal and unpredictable enemy attacks. No range attacks, no "elite" enemies unless you count alpha wolvers have 2 extra blind forward bites hard to dodge. Chromas invisibility is subpar when compared to Ghostmane cloaking which is actually lethal and tricky.
My theory is that they needed SOMETHING to act as the first goomba stepping stones, and what better way to start the game than with chroma welps and jiggle jam cubes? End game is for grimdark "oWtHeEdGe" shadow dealing damage only. Which means the game is set up to get you to craft free cobalt armor recipes only to make you do some research and hopefully make you spend more time making Chaos Cloaks and grinding for BKC sets. Because if you could just use Skolver/wolver sets the entire way through, THAT'S NO GOOD.
Believe it or not, you can make it through the game without Chaos and/or BKC.
And yes, not all monster families were created equal. The difficulty scaling of beast/slime -> gremlin/construct -> undead/fiend was probably intentional. Someone has to be the tier 1 boss.