If you don't see how that's fluid and why it's valuable then that feature isn't for you. But it's certainly unquestionably fluid unlike a lot of other trash apps.
It most certainly does, lol. There's a lot of programmers who have literally zero design aesthetic. I bet 99% of the people who don't understand what "fluid" means in this context fall into that category. Anyone with even a remote sense of aesthetics and design will immediately recognize the fluidness of the navigation/animation/flow