Power hacksaw from PVC - video

Power hacksaw from PVC. By KST HACKS. 9:04 video:

https://www.youtube.com/watch?v=sJMrCRVrLtw

Don’t mean to sound disparaging here, I just don’t understand why someone would use PVC to build things when in my mind they should clearly be made of steel or possibly aluminum. Get it, easier, but flexy and crappy no?