I don’t know it would make sense to you, or most, but it felt like a breach of trust and seeing it is still baked into the browser itself (yes, they bought it; yes, you can turn it “off”) and that you can’t “completely remove” it, I don’t “that part” has changed. Besides the separate standalone add-on was a lot more useful and I was a full time user until that debacle when I moved to Safari (and Pinboard).
Would it have been better to have built it internally instead of through acquisition? I admit I'm unfamiliar with the inside baseball on it's integration, but breach of trust sounds pretty drastic. My read (as an uninformed outsider) is that they probably acquired Pocket for a song, it filled a gap in the product offering, and it offers the potential of a future optional revenue stream that aligns well with the web as a document reading medium (subscription).
There's all sorts of internal browser features you can't 'completely remove'. How is bookmarking different?