The author uses a cloud-based spreadsheet to access it anywhere on any internet-connected device. These can also be shared with others.
Some software, like Google Forms, for example, allow users to provide a simple form to enter data into a sheet.
I don't think I could stand keeping track of it in a spreadsheet: - You can only access the data from the computer the spreadsheet is on - Can't share with other people Lastly, and most important to me: - I find it ugly to look at spreadsheets or enter data into spreadsheets
The post is a useful list for people who want to create a todo list app about some potential features. I think that even if there was an app that addressed all this (and I think there are apps that do address most of these points), the OP wouldn't be convinced to use it because a spreadsheet is just much more familiar to the him and he doesn't find them ugly.
I personally have my own todo list app that I created and always use (along with paper for more free form notes). In fact, there are 4 different versions of a todo list for different purposes. I like it because it works exactly how I want it to work and I can change it as I desire. I suppose there's also a degree of pride in using my own app.