Texts conjure up the expectancy of immediate/near immediate response. All too often the question doesn't merit that. I would rather not have my cell phone be a conduit for what you think is important...but isn't.
Secondly, many of us prefer to reserve texting for friends/family/work urgencies...not for sundry office dialog. Email is my preferred method for work communications. If the situation is complex enough where an email dialog would take much longer than a voice conversation...then call.
Some people are just too lazy to write a coherent email and insist on poorly written unimportant texts. Non important texts get ignored. Repeat senders of non-urgent work texts get blocked.