I feel like I'm misreading you, because we typically tend to agree on things. I identify as bi, and to me this reads too close to a lot of (honestly offensive) myths I've heard about bisexuality and monogamy. You're right that being bi and monogamous means not "having everything that [you] might enjoy sexually". But so does being straight and monogamous, or gay and monogamous... Because if you're in a relationship with a real human person who you love and respect, you're not going to get everything you might enjoy sexually all of the time. For couples who are particularly sexually compatible, both partners will get a lot of what they want a lot of the time... But it's always going to happen, and generally my sense (whether you're gay, bi, or straight) is that you find things you do enjoy with the person you're committed to, such that "not having everything you might enjoy sexually" becomes pretty meaningless.
And hey, to be honest, even being non-monogamous often means have to deal with not having everything you might enjoy sexually, for various reasons that come with being human.