This is very true. Men don't know how to talk with women anymore. I rarely overhear any teases or flirts with women.
Most guys are SO EXCITED to SEE A GIRL in front of them. Wow, a woman! Wow, a wet hole! What will I do????
Then they proceed in this happy-go-lucky, super questioning mode, where every one of her answers is followed by a "wow, that's so cool!!".
Do not do this.
Everything is chill. You're just talking to a stranger, just as you would talk to some guy who spots you in the gym. You can comment on their shirt, or make some observation about them. Or, honestly, you can just straight ask their name and then say "I see you often here, so I have to say hi".
The opener really doesn't matter. What matters most is that you open your mouth.
You don't have to dedicate your life to cold approach. I'm going out with a girl tomorrow I "cold approached" in the gym because she was using a machine I had to use. I needed to use it so I asked to switch in with her. Then I got her talking and now we're going out.
You can do the same thing at any social event, or music event, or grocery store. Literally, ask about types of bread if you want. Or what the best flavor of peanuts is. It really doesn't matter. Anything to get her attention will do.
Start off chill, then start flirting with her. Bust her balls a bit (in a playful way).
When I close, I don't ask for her number. I just give her straight eye contact and say "We should go out sometime". Hold the eye contact and wait. If her response is positive, you get her number.
I like cold approach much more than OLD. To me, it's more human. Less swipes and more real conversation. You still fail, but afterwards you always feel proud that you overcame your fear.