Honest Question | Using Two Treadmills at the Gym?

Ok, I saw an Instagram video where someone had two treadmills running at different speeds at the gym (for intervals). At first I thought it was comedic but honestly it makes a bit of sense.

When doing hill intervals on the treadmill, it takes a decent amount of time for the machine to adjust to 15% grade, then back down to flat.

Has anyone done this in the past? Would I be an asshole for using two treadmills even if the gym isn't crowded?

Thanks for your feedback!