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The tax number and the ID equally identify you, but the tax number is normally for identification for money/business-related stuff and the ID for the rest.
Your ID expires, because sometimes the goverment wants to change the ID and only gradually give the new ID out or if you die the ID will, because of the time expiration, someday expire and not just continuing to be able to use. You still exist and you are still identifiable through your birth certificate.
cabrasm2295dIf the expiration it’s every 5/10 years, it’s understandable. You might not change name, birth or whatever but your appearance could