"undesirable"

Twitter changed settings.

Reason:
"...receiving one-sided fragments via replies sent to folks you don't follow in your timeline is undesirable. Today's update removes this undesirable and confusing option."

How do they know that this is undesirable? And how do they know this is unwanted confusion?

I disagree.

I love to see these fragments. And I love the partial and sometimes temporary confusion they create.