Sorry to keep harping on this, but it’s not just strange, it’s technically incorrect. Italics are used for emphasis or quoting, not for organizing thoughts.
Surely there’s another method you could use.
Oh, I know it’s incorrect.
But for whatever reason I got it into my head several years ago that text in parenthesis should be in italics. So whenever I add some “extra” information I just instinctively write that in italics as well.
Like I said “bad habit”.