Like, it's probably more noticeable that you don't have any romantic or sexual relationships than it would be if you don't have any true, close, platonic connections. Romantic and sexual relationships have things that are very obvious and for the most part, exclusive to them, such as kissing, making out, sex, etc. Platonic relationships that are true and close are not as visible, they're more feelings on the inside (not to say that there's none of those feelings involved with romantic and sexual relationships). If you look exclusively at the activities done with a platonic friendship, it's not very different from an acquaintanceship, or an activity partner.
I've met people who claim they have friends, but they're just coworkers they talk to a bit, guys they play games with, or guys they see at the sports bar a lot. Not people who actually support each other or any true connection. Now granted, there's nothing wrong with having those acquaintanceships or activity partners, and it can be argued that they're necessary for a fulfilling life, but they're not the same as a true connection or friendship. If you've never had that or hadn't had it in a while, it can be hard to tell what that feels like.
The only way to make these connections is through social skills, which a lot of people lack. They lack social skills, so they don't make connections, platonic or romantic. Since romantic and sexual connections have more exclusive activities, it's more easy to notice them than the lack of true friends. So I'm wondering if all this talk about the lack of romance and sex is really just poor social skills.
Under capitalism sure. Under an actual communist organization with proper training and moderation the odds are a little bit better. In any case, it doesn't need to be a dating app, just a way to help people socialize and find love. China is doing some stuff with dating right now that I think is interesting.