It absolutely makes the watch unusable and it's frustrating that people are suggesting otherwise.
As I've written extensively here, this is more than 80% of my interaction with the device. Removing this user interface is removing the functionality of the device.
Prior to sending it back to revert to OS9, the only thing I was doing with it was putting it on to track fitness for an hour and a half a day. Then I would take the useless device off.
It's not crazy talk. It's FAR more than an annoyance. They have REMOVED THE USER INTERFACE. It's the same as if swiping home screens from iPhone or iPad were removed. Worse, really. It's like removing the Time from a watch.
If Apple doesn't listen to user feedback and revert the operating system to something that's functional, my current Series 8 on WatchOS 9 will be the last Apple Watch I own. This isn't a threat or a promise. It's not something I want. It's an inevitability that Apple has burdened users with. That's the part that hurts the most. Well, that and people claiming it's not unusable.
The more I consider it, the more I worry. Smart Stacks is supposedly the replacement for changing watch faces. Smart Stacks is a horrible design for people who want lots of information at a quick glance (this is what I thought all Apple Watch owners used their watches for). The crown is imprecise - it's wiggle-y. Not enough data is shown at once. It's cumbersome, inefficient, dynamic, and not predictable. It's a bad user interface for a smart watch. A smart watch should function primarily as a device to give you a lot of information as bold and efficiently as possible. WatchOS 10 fails on many accounts to do so. This is an observable and repeatable objective fact.