Not everyone is able to use text messages. For example, if I get a call from a business that's returning my call, they're probably calling from a land line that doesn't have texting capabilities. And a non-online business (e.g., my doctor or my car repair shop) probably doesn't have my e-mail address and/or doesn't want to deal with customers via e-mail (it's an extra communication channel that someone at the business needs to monitor).

Also, if I want someone to reply to me quickly, I'm not going to put extra hurdles in their way to make it more difficult for them to do so.

On the other hand, if I'm calling a friend's cell phone and they don't answer, I usually leave a text message instead of a voice mail since it's easier for them to deal with.