It's less the speed of typing but the continual back and forth of texting and the delay between messages. You send a message, you get a reply - sometimes later

It's less the speed of typing but the continual back and forth of texting and the delay between messages. You send a message, you get a reply - sometimes later on in the day and you don't want to be that guy by hassling the recipient of your text messages by keep nudging them. Example, today on the train I texted a mate to see if he was about as we'd previously discussed meeting up today. I was going to get off the train at a particular stop if I was going to see him but otherwise would have carried on. I texted him and didn't get a reply until just before I was going to get off the train, which was about 40 minutes later. If I'd just given him a phone call, I'd have known immediately. It was all fine in the end but if I hadn't received his text before the first stop, I'd have continued on my way assuming he was busy. But because now the default method of communication is text messaging, I feel I can't make a phone call any more.