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> A reason to not demand USB-PD, such law would prevent upgrades to later better version of that thing.

Can we apply some common sense please? You're right that not allowing revised standards would be silly. So, they simply update the law to reference newer versions of the standard. https://eur-lex.europa.eu/eli/reg_del/2023/1717/oj

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How is a better standard going to be developed, though? Manufacturers aren't going to innovate, since they aren't allowed to sell anything besides USB-C.... so who is going to do the research and development for better designs, and how are we going to compare different possible improvements if manufacturers aren't allowed to try out anything new?

Stabdards development is very much done to push regulators to adapt new things. The incentive is either to be able to develop new products that give a reason to upgrade, or royalties from the standard, or patent license money.

They are allowed to try out new stuff as long as the baseline is also met. Hence no problem for Apple with MagSafe for example, because their laptops also have USB-C charging.

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