Why do some people not use programs or apps?

Well, I think the main reason is that some people just prefer simpler ways of doing things. Technology can feel overwhelming, especially for older generations who didn't grow up with apps. For example, my dad still writes shopping lists by hand because he says it helps him remember better than typing on his phone. Also, some people worry about privacy-they don't trust apps with their personal data. In Shanghai, I've noticed many small shops still use cash instead of mobile payments for this reason. So it's really about comfort and habit more than anything else.