If you say no CEX at all, that is not possible, traders rely on CEX to trade. If you want privacy, do not scalp and day trade but focus only on buying and selling bitcoin using decentralized exchanges like Bisq or the use of this forum.
Not only traders but even investors who are from countries where adoption of bitcoin and cryptocurrency at large isn’t big and their currencies are hardly available on these decentralized exchanges. Converting them to the available ones would still require you to swap them to your currency. My only advice when dealing with these exchanges I.e centralized one’s is that do not treat them as wallet but rather as a marketplace where you buy and take off your funds.
As for traders use two or more of them so that when one eats the dust you down you have another to turn, considering you never leave off large amounts on any of them.
Additionally, how would you feel safer to sell 1 btc or more? In binance/coinbase or a p2p plataform.?
Binance will not exit scam you for 1 btc... but a p2p guy might.
And I think if one gets scammed on this P2P while using centralized exchanges they do try to return one’s fund although little amount hardly gets the exchange attention and but something like 1btc sure does although it also takes time. The P2P scammer are easily gotten by the KYC they submitted. Sadly this is the advantage of it