Is it safe to delete the "username-prohibited-characters" validator on username?

Hello,

I would like to know if it is safe to delete the “username-prohibited-characters” validator for usernames. Specifically, if I want to allow spaces or other currently prohibited characters in usernames, will removing this validator enable me to create such usernames without causing regressions or technical issues?

I tend to think that if the validator is set by default, there must be a reason, hence my question.

Thank you for your assistance.