Personally, I don't view a black/white Kindle as the same as other screens, so a bike ride to a park where I might read a research paper or book I've put on my Kindle.
Getting into the "mental mode" to do one of those things requires using the device built for it, and putting away my general-purpose phone/laptop. The great thing about focused single-purpose devices is it's impossible to get "lost" clicking around and wasting time.
If I'm on my Kindle, I'm not scrolling through the news. If I'm on my TV, I'm not getting lost down some YouTube recommendation rabbit hole.
The more I started turning my laptop into single-use (cutting out social media, focusing on productivity), the more "bored" I was at first, but then I realized that's actually a good thing. In addition to all the above I have my piano I can practice on, too.
Being bored is good. The modern web and especially social media vehemently disagree, and so our incentives have diverged.
I took this approach when I was in grad school because I find it much more enjoyable to read and take notes directly on a physical copy.
The problem with this is that you end up with giant stacks of papers that take up a good amount of physical space. Every physical copy becomes a subsequent judgement of whether you need to keep it or recycle it. It's easy to accumulate a large stack of papers: (1) that you _intend_ to read, or (2) mediocre papers that create a sunk cost situation because you've invested time in printing out and taking notes on it.
On the face of it, a tablet reader seems like it would solve this problem, but I've never had the desire to invest $300-500 in one.
Personally, I don't view a black/white Kindle as the same as other screens, so a bike ride to a park where I might read a research paper or book I've put on my Kindle.