I’m using Omnifocus since Version 1. On an old iPad IOS 6 is still running Omnifocus for IOS 1.6 in our cookbook shelf in the kitchen. We use it to manage our food supplies in the basement and in the very large freezer :)).

I started my IT career while studying chemical/physical engineering in 1973 in one semester for 1.5 hours a week on an IBM mainframe with coding on punch cards. Fascinating! No monitor, no keyboard, just punching holes and seeing what the printer produced. For me, those few hours with punch cards were the beginning of my later 26-year career as a software developer and co-owner of a software company, all through learning-by-doing, without any training in IT.