There are many things which I knitted in the beginning which weren’t directly useful, but which eventually did serve a purpose. I like to think of those pieces as “samplers”. I learned a lot from them – stitches, techniques, speed, etc. Everything can be a learning experience, if you let it.
But these rectangles can be pieced together to make up a blanket or a quilt top. Very practical! When you get many of these “samples”, put them to use. Or use them as a starting point for something else – add to them by picking up stitches along one edge, or all around, and keep on knitting! The colours or even the yarn weight don’t have to be the same! Be creative!
There is nothing wrong with ripping out your work. It can be therapeutic!! I know many women in poor countries that have only one ball of yarn. They knit it – and then rip it out and start again on something else, because they need to keep knitting. That is perfectly fine too. Some people like the finished item, some enjoy the process of knitting. Which are you? Either one is perfectly allowable.