Of course I’m dealing with an older than primary demographic (30-50), which might have something to do with it, but I think you’ve hit on a scarcity issue caused by the temporal nature of interactions on the apps themselves. The longer you spend online, the higher the chance that someone else will come along and be more efficient in setting something up with the one you’re talking to.
I’ve only been on the swipey apps for a month now, but I’ve found myself regularly unmatching anyone where I feel like it will be too much work because of this phenomena. It’s like an incurred opportunity cost of dealing with people who are too hesitant.