Yes, there are some differences between tablets and eReaders. Even though tablets provide the user with more capability, they are harder on the eyes and have a low battery life. I guess some eReaders can last up to a month of use before having to recharge the battery, and you can also use some in the sunlight with no problem. I think Kindle makes one like that.
Thanks for your feedback and welcome to our forum. Like you, I do love technology and am looking forward to future inventions!