Why didn't Bitcoin implement segwit in the first place?

Why didn't Bitcoin implement segwit in the first place?

Why didn't Bitcoin implement segwit in the first place?

Why and how does non-segwit Bitcoin enable a miner to change a transaction's txid?

From Mastering Bitcoin ch. 7 § "Transaction identifiers":

Before segwit, transactions could have their signatures subtly modified by third parties, changing their transaction ID (hash) without changing any fundamental properties (inputs, outputs, amounts).

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