A core wallet isn't centralized. All exchanges run on core.
No it doesn't, I propose and educational tiering here, kind of like a Russian nesting doll, a simple set of read more buttons can open the next level of education if wanted.
You have to understand people just react 90% of the time before they observe and react informed.
If you place your trust in a particular developer, it's possible that BTC will experience an FTX moment. Imagine every bitcoiner promoting a specific wallet. The App Store and other third parties can introduce a malware/backdoor into that wallet. As a result, a lot of cryptocurrency will be lost by millions of people.