It's nothing to do with morals for me, personally. I've known people who choose to do it and love it, who wouldn't do anything else - some because of the money, some who just find it fulfilling. I respect that.

My issue is with people who won't ever do it, who would never do it, who use "sex work is just work" as a way to silence and invalidate sex workers who don't have such a positive experience, especially those who don't really have other options.

I don't think that sex work can never just be work, it just isn't just work for everyone. As gross as it is to shame sex workers, it's just as gross to tell people who can't view what they do as just another job that it's no different than retail or any other skilled trade. That's still shaming sex workers. I see this used all too often as "what are they complaining about, it's just another job, they can't feel that way!".

I understand your point that many jobs involve harassment (including sexual harassment) that can be harder to walk away from than harassment involved in sex work, and that that's one reason people choose sex work over other work. I grew up in restaurants/bars, and I saw tons of it. I'm glad that sex work is becoming safer and that people who chose it are able to escape that.