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The question is, what if your husband wanted to have more wife? Would u object to share his time? If yes, then u r forcing your will on to him.

My husband can please himself what he wants if he wants more wife then he can do so but i won't be sticking around

It's actually not about necessarily having to have more than one partner, but about not limiting yourself or your partner and to be open to fall in love with someone else in case it happens without the need to drop your actual relationship. A bit oversimplified and a more passive approach, but that's basically the idea behind it.

I don't think I am capable of loving more than one partner and the whole idea does not apppeal to me but everyone is different

There is plenty people who cant cope with even one husband.

I'm sure that means monogamy is truly unworkable idea, right?

Its all down to the individuals needs. Everyone is different