There's a lot of interesting things to unpack about Stillwell being a woman in this story, especially given her role in facillitating the misogynist culture of the Seven as well as their corporate empire.For me personally, I found it more palatable because Robin is introduced and dies within a single scene. She's barely more than a background character, and the audience is given no real time to build a connection with her or invest in her relationships or arc. Its just "oh hey Robin", followed by 20 seconds of onscreen banter, then *splat*. A lot of time fridging is used a shortcut to audience investment--"let's make them love this cool female character, then have the bad guy kill her so they're really hate him!"--and this fast-forwarded past all of that emotional manipulation. There are cool, fleshed-out women in The Boys--I genuinely think Starlight is fantastic, Maeve's stirrings of a conscience beneath her studied indifference are interesting, and even Stillwell is a terrific and very original kind of villain--but Robin isn't one of them. Robin's not anything really except a brief setup to a very dark punchline. They aren't trying to make her anyone's favorite before she dies, and while Hughie certainly hates A-Train for killing her, the show isn't really concerned with making the audience feel the same way. In fact, Hughie's arc is to ultimately decide that using Robin's death as a justification for revenge is complete bullshit.
The gender swap made her quite a more interesting, IMHO.