Sure. Apple also created the concept of completing a set of rings specific for activity types in a way to represent a daily achievement. It's an idea that was duplicated one-for-one; in my opinion the design is a mimick at best - so I do agree with you.
I'm not going to go so far as to say that Apple created the ring concept as it relates to activity. I honestly don't know. Fitness apps and sites have existed long before the Watch and I honestly don't know who came up with the ring concept. I've seen a macro (food) tracking app on the iPhone that uses rings to show overall consumption of the various macros one is tracking. Was it available before the Watch? I don't know. Anyway, whether they created the concept or not, Apple definitely popularized it. Rather than create something just for the sake of being different, I think Google probably recognized that activity rings are a concept the public now understands, a standard if you will, so they adopted them too. Call it a mimic if you like, but I don't see it as a lack of imagination on their part.
Google will always have a problem with design though, so I'm more disappointed in their lack of imagination in the concept level here. I hate the "it's the same but different" from them since they often push those envelopes. If they had done that, they wouldn't have to worry about diffing their design from Apple's.
I've actually been digging Google's more recent design and UI work. For years it was an absolute mess, but I recently tried Google Music for a while and the UI is much better than Apple Music. I feel the same about the Google Maps UI over the Apple Maps UI. If anything, I see Apple getting sloppier and sloppier in the UI/UX department while Google seems to be improving. As for this particular product, I haven't seen their watch or used their activity app, so I can't really judge the product. Certain aspects do resemble Apple's work, no doubt, but that doesn't mean it's a slavish copy. I'd need to use their watch before I could determine that.
I also don't think the Apple Watch is anything to brag about in terms of design or its UI. My mom gave my dad one last year for Christmas. He tried it for a week or two but just didn't get it, so he passed it along to me. I only wear it when I go to the gym or exercise. Apple has done a pretty good job on the activity tracking side, but overall I find the Watch UI a confusing, fiddly, over-complicated mess. Definitely not Apple's best work by a long shot. So I'm not willing to judge's Google's "lack of imagination" until I've used their product. Quite frankly, I hope they didn't copy WatchOS too much!
There's a reason why no one was pointing to existing circular progress bars when Watch and Activity came around in contrast to this.
Oh come on, you know good and well that the only reason people are getting worked up about this is because Apple fans always need an enemy. I've been a fan/customer for nearly four decades. Back in the day it was Microsoft. Today it's Google. Apple fans seem to define themselves by how much they hate the enemy's products, how badly the enemy rips Apple off, how unfairly Apple is treated, etc. There's a lot of martyr/victim thinking in the Apple fan community. When I saw the Activity UI, I thought it looked pretty cool, but I didn't think, whoa, Apple has done something totally unique here! I've seen plenty of circular progress UI elements in my years. Apple's Activity UI was another well-executed example of a concept I'd already seen many times.