Everybody says this. I heard this from older people about dating 10 years ago, and 20 years ago. This is just what people say as they get older regardless of how dating changes.
I dunno. There is statistics that show younger people to have less and less sex. And it certainly is not because of more prudeness nowadays. While not the final indicator i do think it to be representative of the general lack of stable relationships.
You make a great point. Also dating typically involves going out and that is expensive. I also think people are more honest today. They feel more comfortable not having to lie about it to seem cool. I think past data are skeptically full of some lies padding the data given the peer pressures of older generations behaviors.
Gotta say I'm glad we can be and date any genders we like these days with much milder pushback (on average) than used to be the case. Really does help zoomers be a lot healthier imo, even if we've got other issues in the internet age.