Want a really secure encrypted device that can't be tracked because you are a criminal:
Fake encrypted Anom gov phones is a really good example, but don't think that all other smartphones are much better, Apple can now scan your system for child abusing images.
Maybe I am old fashioned but I never liked or trusted this devices and all trend of using just one device - smartphone, that is only make people more stupid looking at them non-stop.
If you are doing a P2P trade F2F how are you sending your BTC to the other person. Electrum on a phone or laptop? Do you know what back end server you are connecting to and what it records? Unless you are running you own node you don't. Are you using Wi-Fi in a coffee shop? Are you 100% sure that there is no MITM attack going on?
What do you know when you use big centralized exchanges?
You know they will leak your data to anyone without you ever knowing it, for example you should know that Coinbase is sending all customer data and analytics to China.
Digital Currency Groups owns huge part of Coinbase and owner of DCG is Li Ka-shing, richest man in Hong Kong, so better think about that.
Running your own Bitcoin node is not so complicated, and people only need to spent some time to learn how to do, but sadly I don't think that only a few people are running node even in bitcointalk forum.
How much do you know about the person you are trading with? How good is their OPSec?
I don't need to know much about them to do private trade with them.
I don't want to be that guy who says it can't be done, but I really think that it's a lot more complicated then a lot of people think.
Maybe it's more complicated than making your own popcorns or toast, but it's not rocket science.