Bitcoin Core offer wallet feature, although it doesn't have built-in swap with USDT though. And while Bitcoin Core require you to download 550GB+ blockchain, it fulfill other requirement stated by @purinZ14. But Unstoppable wallet is still good choice for @purinZ14 needs.
@purinZ14 had many requirements which bitcoin core didn't meet all. Bitcoin core met the requirement of security and decentralization but it is not a multi coin wallet. But in the other hand, Unstoppable is decentralized, secured (although<bitcoin core) and also multi coin. I think unstoppable is more appropriate to what purinZ14 wants.
I don't know why you say wrong topic.
This topic usually doesn't get users banned.
That's true. Although it's good enough if this thread can make user stop spread false/fake/unhelpful information.
If I'm called out here for spreading false information, I be careful when posting next in the technical board or stop posting. Because being called out here always will lead a user to people's ignore list.