I think its essential to be honest. You kind of want the worst that can be thrown at bitcoin and see how it fares. Cars go through all sorts of crash tests.... and so do helmets, and so do bullet proof vests, etc. If someone wants to start a project to take down bitcoin and throw as much money, energy and resources that they are available at it, I think its a wonderful project to tackle. The end result, no matter how it turns out, will provide a wealth of information.
The real problem for crypto is quantum computers. So far they are too primitive and too theoretical at the moment to be of practical use (which may be a good thing). In any case, Vitalik was working on a solution in advance to counter them, lest Ethereum falls victim by surprise. So I'm not going to lose too much sleep over this.
Yes, this is something that I came to learn as well. Once I found out that my Trezor needed to use the Trezor node, privacy kind of goes out the window. This is why a few months ago I asked the question about how to hook up my Trezor to my own node that I had setup on a separate computer. Now I think the Ledger device almost allows you to connect it to the BitcoinCore node, but I'm not super sure. I do see though that @Odell on Twitter recommends the ColdCard hardware wallet, and I think this can run with BitcoinCore, which I think would make this a really good combo.