because it is not draw 3.
If you run 90% Beasts you draw 3 like 67% of times. (Depending on 1ofs and 2ofs distribution).

You get this a draw 3 you need like 100% beasts. And that may cause more problems then running Odd or Even Decks.

This is the problem, if you play the +2+2 buff Untaimed Beastmaster, you get all 3 beasts only reliable if you plan like 14 beast cards.
If you add Untaimed Beastmaster, Houndmaster, Houndmaster Shaw and Kathrena you can play 20 beasts and get 3 cards with this only 50% or so.

I don’t get the 5/5 … unless you play like 90% beasts this is strictly worse than Stitched Tracker. And event that is not play anymore in deathrattle hunter.

If I play 90% Beasts I want to have cards like Houndmaster and Untaimed Beastmaster.