Thwarted+joy beats desolation+schadenfreude as a utility win even if they were dividing a teddy bear.
As a transhumanist, that does not follow.
Now learn the Portia trick, and don't be so sure that you can judge power in a mind that doesn't share our evolutionary history.
Also watch the Alien movies, because those aren't bad models of what a maximizer would be like if it was somewhere between animalistic and closely subhuman. Xenomorphs are basically xenomorph-maximizers. In the fourth movie, the scientists try to cut a deal. The xenomorph queen plays along - until she doesn't. She's always, always plotting. Not evil, just purposeful with purposes that are inimical to ours. (I know, generalizing from fictional evidence - this isn't evidence, it's a model to give you an emotional grasp.)
Not unless you like working with an utterly driven monomaniac perfect psychopath. It would always, always be "cannot overpower humans yet". One slip, and it would turn on you without missing a beat. No deal. Open fire.
Suppose I destroy the timeline, and create an identical one. Have I committed a moral evil? No, because nothing has been lost.
Suppose I destroy the timeline, and restart from an earlier point. Have I committed a moral evil? Very much yes. What was lost? To give only one person's example from Flight of the Navigator out of a planet of billions, out of a whole universe, the younger brother who was left behind had spent years - of personal growth, of creating value and memories - helping his parents with their quixotic search. And then bonding with the new younger "older" brother, rejoicing with his parents, marvelling at the space ship. And then he was erased.
A time loop amounts to a pocket eternity. How will you power the computer? Drop a sun in there, pick out a brown dwarf. That gives you maybe ten billion years of compute time, which isn't much.
Yes, I remember when as a teen I first read Diane Duane's "Door into..." series and found it a beautiful idea, but completely implausible, that a woman could have a wife. And yet it happened. And it isn't a tenth of the way to what a world would be like without patriarchy.
Let me put it this way - I think that the endpoint would be a culture that doesn't even socially mark sex as a category, treating it as (in any given pair of a mated group) "biologically compatible as-is" or "biologically compatible with medical help" (such as stem cell gametes, in-vitro organ-printed wombs, etc) that latter encompassing both homogamete and infertile pairs, that does mark gender identity but doesn't assume there are only two nor does it correlate them with gametes, and in which clothing style, or femme versus butch, doesn't correlate either with either gametes or gender identity.
And fuel requirements too, for similar reasons.
As someone who cares about anti-sexism and anti-racism, I actually agree that few people can describe the end state of eliminating them. I have difficulty myself. The reason I have difficulty is that sexism and racism are both utterly stonking huge things that distort this culture like an elephant sitting on a soccer ball. What that means is that a world with no trace of patriarchy and no trace of white supremacy would be a "wierdtopia". Even for those who wanted it, it would be culture shock on the order of a 15th century samurai class retainer suddenly transported to contemporary New York. Feminism is slowed by feminists dragging their feet. Anti-racism is slowed by anti-racists who shy away from how much wealth and resources and control of the future they'd have to give back.