No current good reason.
Historically the first computer passwords were written down. Passwords with spaces were harder to read this way. Really any complex Password that wasn’t letters and numbers was harder to read. Password rules were created based on that max readability. 0-9/a-z only.
Over time that’s remained and slowly faded away. 25 years ago you couldn’t put special characters in most password entries. Now many require it. Modern password reccomendations include spaces and in a decade that will feel normal, if not outdated by password less MFA
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