I know we're still looking at early builds but since I was very vocal in criticizing the OneDrive 4.4.0 UI changes that gave a big nod to Androidification, I must agree with the OP on the poor direction that Microsoft is taking with their universal apps for Office. Unfortunately, it completely takes away from the awesomeness (can't believe I used that word!) of what touch Office will be on phones, compared to the offering we have now on WP8.1. Imagine having the full Word engine in the email editor with rich formatting, tables etc! And yet, the UI stuff that they figured out way back in WP7 in terms of clean, simple, clear typographical UI presentation, they've undone for Windows 10 in big way.
We have to challenge this direction -- it worked for OneDrive, it can work again for Office. #saynotohamburgerUI