IRL convos are very different than online ones. If it's not important enough for a call, taking time "out of a busy schedule" to text also requires letting the recipient take time out of their busy schedule to reply. People really need to chill out when it comes to messaging. The recipient's time and reasons for responding when appropriate are just as valid and important as the senders time. Dropping a quick busy reply sometimes works, but also interrupts a persons flow. It's much better if a sender just has the proper perspective.