The problem is that the column width is so narrow you can’t see enough of the Task Title.
The Task Title is the most important information; it needs to be seen in as much detail as possible.
There is a limit to the width because if the column is too wide, it can’t be comprehended easily—too long a string of words becomes something you can’t simply see and know all it says.
That optimal width may be as much as 4 times wider than the current column width in the Next 7 Days view.
In a similar vein, for most users, the Task Title is more important than info than seeing Tasks in later days.
Either way, while a user can scroll to the right to see later days, you have to click on the Task and bring up a Pop-Up to see enough of a longer Task Title to comprehend it fully. The problem is that when you have a Pop-Up on the screen, you can’t see other Tasks and understand the larger picture of all you have to do.
The key is seeing several Tasks at once, comprehending them immediately without doing anything else, and then deciding what to do next. More text in Task Titles, meaning wider columns, does this.
Making column widths adjustable allows users to tailor all this whatever they prefer—this is what I’m hoping.
P.s. adjusting one column should probably adjust all the day’s columns because it makes working with columns easier and more aesthetically pleasing.