Broadcom / Rasp. Pi chips have historically been _VERY_ bad at idle though compared to their peers. So I think its safe to say that RP5 will also be bad at idle (though I haven't read the spec sheets or seen any such tests yet).
“The Raspberry Pi 5 is the hottest of all the Raspberry Pi boards we have ever used. At idle, without any added cooling, it sits at around 50.5 degrees Celsius and consumes around 2.7 Watts“
If that were classified as “electrical and electronic household and office equipment”, they could not legally sell that in the EU (https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=uriserv%... is not yet in force, but its predecessor already limit standby power usage to under 0.5W)