You're just characterizing the checkpoint, not addressing the decision making behind it.
The decision making behind it was pretty simple though. Since there was the threat of attack from dishonest miners, they imeneted some protection. It is an old concept in blockchain.
Blockchain was the invention of Satoshi that solved an old computer science problem. It gave you a digital asset that could not be copied and pasted. Blockchain is what makes Bitcoin.
Yes, Bitcoin uses a blockchain but didn't come up with the design the novel invention was the POW mining game. A blockchain without POW mining is only useful in niche cases.
