Author here. I address data portability in a step-by-step process in the blog post. Long story short, it’s too much hassle while still being imperfect. If data sharing is important, it’s not a good choice. If you’re content to build a little spreadsheet that exists solely within the VisiCalc and VisiClone world, then it might suffice. I suspect the average user has higher baseline expectations than VisiCalc can deliver. You need to really try it out yourself (Dan Bricklin has the 80-column DOS version for free on his site) and see what it lacks firsthand.