I like thinking about centralizing personal data when it does not get bogged down in technical minutiae, but rather clear your mind and help you trace the bigger picture (on the place/aim of information in our lives)
By implication, I mostly sat in the middle. But the recent GPT-3+ advances convinced me to prepare for loosening the centralizing grip a lot more.
I'm very much a centralized person and I've been loving Zotero. It's great for taking notes and categorizing content from a wide variety of sources. It's primarily meant for research and so if you write papers you'll love the citation tracking features but it is just an all around great program.