You don't need a "burner" laptop/phone for entering the European Union. There are no routine checks of electronic devices except the usual x-ray machines.
Some EU countries have more of a Russian position on these things!
I very much is a question of national, not EU law so you cannot generalise about the EU.
Where the EU does have laws on these things it has been very anti-privacy and pro-surveillance.
(Had my phone swiped once)
If you have adequate physical security it is less necessary thus my home desktop is not encrypted.