It's not just the rigid "we know better than you do what you want" inability to alter anything related to active window borders, fonts or font formatting, not just the no-brainer courtesy that some simple coding could have achieved in retaining the preferences
from people's Office 2010 suite, it's that horrid thing on the left-hand side you have to plow through just to get something opened or saved.
Once upon a time, you could click on File and then on Save As, and up would pop your system's Explorer screen, from which you could pick a destination. Now it's an exciting vertical bar down the left edge, which opens up an exciting column of fashionable icons
with "Computer" and "+Add A Place" and "Browse," which if you manage to jump through everything correctly, will get you to that Holy Grail of Computing, the... Explorer window.
Is this necessary? I'm thinking it provided a "Team" at Microsoft a whole lot of exciting busywork for a few weeks, but for the rest of us it's ten more needless, mind-numbing navigation steps to do something that used to be simple and intuitive.
Clicking on that catastrophic "New program updates are available" bait is the single worst decision I've made on this system in a decade. Can you just admit you screwed up, and give us back our Office 2010?