Well, speaking as someone who prefers text in pretty much every case (although I will pick up the phone for those who I know get immediately right to the point)...those who call by preference almost exclusively (a) ramble for way too long (multiple minutes) either about actually nothing, or exclusively griping, before finally asking me the yes/no fifteen second question "they called for" as well as (b) often calling when it is convenient for them, but inconvenient for me, leading me to either answer and immediately try to explain now isn't good (both obligating me to call back AND irking them while simultaneously interrupting what I was actually productively doing) or...not answer the phone, which leads to voicemail, whereas a text I know the issue and can get back at my first available moment.

Often, people calling want to describe a sticky situation and get my feedback on it, and a call means I'm obligated to reply with my impressions immediately/semi-immediately, whereas I prefer to take a small amount of time to think fully about something before I spout off. Finally, habitual callers often don't have their question/situation description mentally ready when they begin the call; if I instead ask for a text, I get a succinct upfront description of the nature of what they're querying about.

Sure, if I'm missing a friend and want to shoot the shit for a while, I guess we can call (although if it's convenient, I'd rather skype or whatnot so I can see your expressions). But if someone just wants my input directly on a small thing, faceless succinct text seems obviously preferrable than faceless rambling me-me-focus-on-me phone calls. It's not a front for anxiety (although I'm glad you can clearly see how remote faceless conversation is innately more anxiety-laden than someone offering the information upfront in writing), it's that texting, for most things, seems both more efficient and egalitarian.