From a millenials perspective, I have to say that my journally habits are yet to be cultivated. I was brought up in a world where pictures, video and short messages dominated the interactions between people. Self Reflection wasn't something I embarked on through creative writing or documentive mediums.
However, I think taking the time to write a journal really is about self reflection and I think it is an important part of every person's thought process which they should dedicated some of their free time to. Perhaps, writing wonderfully curated posts daily is asking a bit much, but for me, I enjoy documenting my life and knowing that I have presented my thought process as best as I can such that I can even revisit later.