Maybe they don't want their computer hooked up to their tv all the time and don't want to be hauling it around to different rooms of where they live.
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kinda makes sense.... but wireless and a long hdmi cable are still way cheaper than a console and buying the game again.
we have a 25 foot hdmi cable under our carpet because my GF bounces between monitor and TV, also have wireless keyboard, mouse, and controller.
for a little extra we could have replaced that hdmi cable with wireless connection.
Keep in mind that having the same account on two different platforms means you can access the same characters, and they'll have all their same equipment and inventory, but Gear Sets, hotbar setups, macros, HUD layout, triple triad decks, (and maybe a few other things) will NOT carry over between the two and have to be separately set up (and maintained with any changes) on each.
Personally, I found gearsets the most annoying (perhaps because they tend to change more often than the others). Anytime you get a gear upgrade and update your gear set for the new item(s), you'll need to remember to do the same next time you're on the other platform. Otherwise, you'll keep equipping outdated gear or trying to change gear and having the system not find all the gear from that set.
I'm more amazed why people would think that just because it's possible to rig a PC that way, everyone should do it. It's also possible to get a console and set it up in the living room so that you can leave your PC where it is, set up where it's most convenient for the other 95% of the time.