Interesting idea, I could see it being useful but it doesn't really solve the same problem. Occasionally I just like reading through all my old note in the order they were created. For reference, the way I use short notes is almost like a second diary or whatever, where I have my journal of long ideas and my journal of one-liner thoughts and notes. And the reason I keep both is so that ultimately I have some sort of record of what I'm thinking and doing. So while being able to search by tags is definitely the killer feature, being able to go through it chronologically is also important.

Also, there needs to be some sort of export functionality, that should be the first feature you add!