I hate asking "Who does that??!" questions like my way of doing things must be the norm for all of humanity, but... I get why people watch movies on laptops and iPads due to the portability/proximity, I get why people watch movies on Mac Minis plugged into TVs or projectors... but what's up with watching movies on iMac? You sit down at your desk with popcorn and watch a movie there? If you watch a movie with friends you pull up more office chairs and huddle around a desk?Oh sure, useless...
*resumes watching Alien DVD collection that cost me far less than the collective iTunes versions would have*
Anyway, I used Handbrake to rip my entire DVD collection to my NAS drive a long time ago... bonus material, commentary tracks and all. Having all your movies instantly accessible in Plex sure beats dealing with discs and tapes. I did that for 42 years with 45's and LPs and CDs and DVDs and cassettes and VHS tapes and floppies and DAT tapes. I did my part and I'm free to never fiddle with those pesky things again.