Slack or similar apps message line length? [on hold]

I just wandering why Slack don't limit somehow lengths of message text displayed on the desktop as if we take it to full screen and don't have any side windows opened, text in the messages is difficult to read?

Do they know that many users scale Slack window and they don't want to hassle with that or they just say if you want you can because why not :) ??

I've took Slack as an example of message app, but - Messenger has different approach - some limits and conversational layout.

What you think?