The vast majority of us are not 5 years old and don't need this restriction. It's frustrating for users who use a similar password for things, especially since Spotify on Android can be glitchy (not letting you log in with the correct password).
I had to change my password temporarily, only to find that in doing so I could not switch it back... really quite dumb. No security issue, just a plain old workaround towards logging in on my phone, and now I can't keep my old password.
Your idea has been submitted a while ago but unfortunately hasn't gathered enough kudos (100 per year). In order to keep an overview of the active and recent ideas in this forum, we will have to close this idea for now. However, this does not mean that your idea has been rejected by Spotify.
If you still feel strongly about your request I encourage you to post your idea again in a slightly different form! Maybe now is the right time to receive the support of the community for your suggestion!
Do you have any further questions on how the idea exchange is managed? Just click here!