[Ding! Host, Beast get humanoid form to
break the shackles on their body to reach S-Rank as huwoman did not have an upper limit but beasts do.
So any beast who wanted to reach S-Rank, needed to break those shackles. and for that they needed to achieve huwomanoid form.
Hence why even the beasts who outright hate weaklings like huwoman's get huwomanoid form.
So to answer to your question, Yes, All beast has huwomanoid form because they needed it to reach into S-Rank.]
System came out and answered Alex clearly with the appropriate reasons as to why this is the case.
Beasts are actually physically stronger than huwomans but because of that they were under the scrutiny by the Heavenly will.
After all, If stronger being like beasts let it be then there would be no saying how powerful beast can be..
No wait, There is, There is example of one particular money who nearly destroyed heaven along with heavenly guards.
