I’m surprised at all the negative takes. I thought it was refreshing, they’re reintroducing colours and icons, cleaning up and using a consistent design language across platforms, and introducing new, well tested convenience features.
Which means that design conventions that happened to be well-optimized for the platform on which they arose are going to suffer.
But don't worry! All the lost productivity will surely be worth the sacrifice if it only provides the one thing that matters above everything when it comes to product and UX decisions: whether it can be used as a positive bullet point on resumes while they're managing up.