That's all changed now. I'd love to know why it's changed. My first thought was publisher pressure. But Kobo hasn't implemented harsh measures. Just Amazon has.
At any rate, I'm now using Kobo for my reading. Easy to break DRM. And they don't assume the same level of control over Kobo ereaders the way Amazon does with Kindle. I have over a thousand ebooks. I'm able to tag books in Calibre, and those tags automatically show up as Collections on the Kobo. It's a simple thing, but Amazon never gave me such flexibility. Makes a huge difference for me.
It's also possible to alter Kobo's UI/UX with various plugins without the need to jailbreak. Kobo (the company) is perfectly happy to let you do whatever you want with your own device. That's such a breath of fresh air compared to how Kindle is locked down.