No, it was designed to replace SMS. Hence the character limit.

And blogger is easy enough to use. Heck, my computer illiterate grandma was using it before she passed.

The problem is that blogging takes time and effort, and the vast majority of people have no interest in it. The only thing they want to do is share their fleeting thoughts and/or tidbits they have found elsewhere. Which they can do easily on their smartphones. Blogging though, not so much.