For most issues, there is really no need for all 50 states to act at once. In practice, the federal government exercises it's extraconstitutional authority for

For most issues, there is really no need for all 50 states to act at once. In practice, the federal government exercises it's extraconstitutional authority for all kinds of things which could be done much better at the state level. For instance, making drugs illegal (accounts for most federal prisoners) and running social welfare programs (accounts for most federal spending). If something really is an important power the federal government must have (maybe some kinds of environmental regulation powers?), then make an amendment that clearly scopes the boundaries of that new power.