Yeah, I use my desktop pc for basically ANY online purchase, let alone just important ones. I don't really use my phone for much at all, aside from texting, actual phone calls, Spotify, and GPS.
What's the difference between using a phone or a computer to buy stuff?
For me, it's a few things:
1. My eyes aren't what they used to be, even with glasses on. Much easier to use a pc with a monitor than to have to squint at my phone.
2. It's just a lot easier for me to navigate through websites, and have multiple tabs open to compare products (if necessary), on a desktop.
3. It is simply easier for me to do this stuff with a mouse and keyboard than a touch screen. Hell, even making edits to posts on this website is a hassle on a phone; wouldn't want to miss something important and have to do the corrections on a phone.