There needs to be UI themes that don't use the same scheme as MS Office.
It is like giving a room a clean look by having the walls, furniture and art be monochrome and close to the same shade. Any designer is going to tell you contrast is important. If everything blends together, it becomes more difficult to see, strains the eyes and thus more difficult to use and rather visually unappealing. It needs contrast between elements to guide the eye, making things more efficient and visually appealing.
Please give us more themes or tap into all the artists that use your products and allow us to create our own themes.
Arpit Agrawal commented
Thanks for reaching out to us. We have noted your concern and will be working on it in Upcoming Releases once we have more users with the same request.