Because they weren’t planned out. Nobody sat down and figured out the rules.
When thousands of people are winging it and the results are based only on collective agreement of course we get irregularities.
Trying to get people to speak in a certain way hardly ever works. The French academie tries to encourage using only French words and not foreign loan words. It doesn’t work, people still use the loan words.
Grammarians used to complain about people using singular “you” instead of thee and thou. Obviously that didn’t work and people continued to speak “wrong” until that became the new correct way to speak.
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