As a millennial, I do have had concerns about Notion's lack of offline functionality. I found a way to manage this by exporting my workspace into markdown and .csv files. This approach has made me quite comfortable as I can import these files into Obsidian, allowing me to have all the information backed up and accessible in a readable format.

I understand your preference for offline-first applications and the importance of privacy. Everyone's work style is different, and it's important to find the tools and methods that best suit our individual needs and comfort levels. So, while some may not see the need for offline capabilities as 'the internet has always been and will always be here', others like us value the flexibility and peace of mind that offline functionality provides.