It hasn't happened. Or, if there exists a counter-example, it very unambiguously hasn't happened at a scale that would imply equality.
So no. Since it's clearly a sexist practice, getting rid of it is more equal than leaving it.
The point of a tech conference is to enjoy exciting new tech and network with people in the industry. Having your sex appeal cast in stark relief to a bunch of models is not part of that.
I can see the history as proceeding like this: finance (and similar industries) used to have a Mad Men style sexist office culture. Then PC rules and HR regulations moved in to make the office a neutral ground. Then the power brokers moved the serious networking old boys' club to the 'after dark' part.
I can't say the goal of this was to exclude women from power all along, but that's the effect of it.
It's not a clear-cut win/loss either way on the whole, sure. But there's no way you can argue that it's not a sexist practice as it exists right now. What you do with that info is always a tradeoff, and I suspect we're on different sides.
... that's a fairly unfortunate context to misuse "literally" in.
(insightful comment though)