Is there any advantages to having a optical drive. I was shown a test between a 15" rMBP with a ssd and a new 15" MBP with a optical drive. The test was how long it took to open some huge photography program. The ssd drive opened it in 10 seconds. The optical took 50 seconds. On a couple of posts here people were insinuating that they prefer a optical drive. I ask why?