Absolutely nobody "wants" to watch WMMA specifically.
I as a male consumer of the product tries to be reasonable in my analysis of female combat, but just being objective and honest, they are not as good as the men. Every now and then you get really good fighters like Amanda Nunes, Valentina Shevchenko and maybe even someone like Jessica Andrade. On the whole, they simply aren't as good.
On the other hand, I can watch female tennis all day, because they genuinely play at a high level. The top 10 on the women's circuit do not constantly trip over themselves with amateur mistakes, in MMA they do.