Camera Zoom isn't equivalent you are right. In BC the shitty 15-45 x50 spotter was better at range by a mile than my sx60. My SX60 was not noticeably any better than my 10x Binos as the binos are perfectly clear where as the camera is somewhat blurry. One benefit it has is you can rewatch things. So if you can only see in for a few seconds. I ended up buying a 15-45x55 Kowa spotter thanks much superior and weighs less than a p900. So I'm happy. The p1000 is a big SOB. Getting into 60mm spooter weight range if I remember right.
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