For me personally, I'd say notifications. I would be nice to have an option to be alerted when someone texts you. I use Spacehey on browser so please feel free to correct me if the mobile version. But I feel bad sometimes because I just simply forget to reply to people because im so used to getting a ping on like discord for example if someone messaged you and then I'd check it. But I leave spacehey open on my browser when I do other things like play video games, read manga ect and I sometimes forget to reply because I forget to manually check it.
But I am interested to see what you guys think