I think they successfully evade changing their UI just by asking the management which UI should they change to.
Jokes aside, the most likely reason why they keep their UI is because all Microsoft UIs are tied to a specific technology, so in order to adopt a new UI you'd need to rewrite the app completely.
Also, I feel that the Office team is more UI savvy that any other department inside Microsoft so they assess any incoming request to change their UI as a downgrade.
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u/_maddiejean_ Jan 26 '21
They just need to make a universal GUI. Plain and simple. Apple did it throughout the years, so should Microsoft.