Yes, I would say it is, in part.

When you say "data loss" you imply the data is gone, nowhere to be found. This is the biggest fear, and should be addressed by backing up your data files to an offsite location.

What you fear is more in the "forward migration" area. If cool software xyz comes out, and I am using abc, then what do I do? Ideally, you would use applications that support an export feature, that would put the data in a list format, comma-delimited format for import into other applications, the new cool xyz software. Not all applications have export feature, and if the one you really like doesn't, then at some point when you want to move, the worst case is you have to manually move all that data over yourself. The good news, you have never lost your data, you just have it in two locations, until you find a way or manually move it all over.

This type of thinking, falls into the, "I don't want to buy a computer today, a faster will be out tomorrow for the same or less money." That statement will continue to be true, even when the new computer comes out that is faster and cheaper than what you bought today. The downside of that thinking is, what value or you missing out on by not buying the computer today?

Or, in your reference to your question, what productivity are you losing out on today, by not using a program that better manages your life than a list. (then again, for some, the list may be just perfect).