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.
Maybe not routine, but UK law allows police and border checks, and did so when we were in the EU. There are credible accusations of this power being over used and misused.
Your employer may need them, but you probably don't.
Burner devices may work when you want to protect sensitive information the adversary does not already have. But if you are more worried about authorities making your life difficult, because they don't like you, burner devices may just make your situation worse. From their perspective, it's clear evidence that you are actively trying to hide something.
>But I base my experience on what is in front of me
Problem with that approach is it makes you entirely blind to change right up until the moment you experience it personally.
It's entirely possible to have a dozen good encounters at borders and only the 13th is bad. Or maybe the situation changed in the last week and you just didn't travel in that timespan.
Casting the net a bit wider and considering other people's experience increases the sample size & liveness of data. (at the cost of some reliability ofc)
One shouldn't base their experience on what they read on the internet either. The internet, and other people, is not your reality. If I lived my life based on the internet, I would never leave my house and have all kinds of security systems all over it (I have none now and see no need for them).
I have never been robbed, never broken into, never been shot at, never had my car stolen and don't know anyone who has.