Their desktop software. If you’re going to switch off the desktop software to something, it may as well be something that isn’t turbotax.

My dad had to upgrade his PC recently to do his taxes as it was stuck on Windows 10 due to CPU support. I suggested a Mac Mini, but neglected to confirm that turbotax Canada supports macOS with their desktop software. My dad had no interest the website version, so he bought another Windows laptop and now has both the Mac Mini and his “tax laptop” that he plans to only use once a year.

Some people are just ingrained in their habits and not interested in change. (Though my retired father was perfectly willing to try a Mac for the first time - apparently new tax software was a bridge too far.)