It's also the 24th century. Some mores should feel odd to us.
There's lots of interpersonal things in Star Trek that might be problematic if they took place today, with normal people, from the mundane of River and Troi working on personnel reviews in 10-foward, to Picard having a relationship with his crew (and it explicitly not being against regs), to the mini-skirts of TOS.
In-universe, I look at it as humanity has evolved in many ways, where greed and possessiveness is no longer a driving force in our lives. SO there's nothing wrong with a captain having a relationship, because, on the whole, humans can be trusted to no let that get in the way of doing the right things, or if they think it will, self-recuse themselves. This clearly wouldn't work in today's universe.
Similarly, out of universe, Grace Lee Whitney always claims she was the one who requested the mini-skirts instead of the trousers of the cage, because being able to be sexy and still a trusted member of the crew was empowering for the time.
In other words, I have no issues with Atoa being objectified, because I would say it's something the character in universe clearly consented to, as well as the actor consented by applying for and getting the role.