So I've been using the same base image in my MacBook since 2008 (obviously upgrading over time), which has gone to an air, to a pro, and now I've got my hands on a new mbpro (non tb). Every time I either transferred with a cloner or straight Thunderbolt with a resizing of the partition. I've noticed that in verbose there are a lot of read write issues with certain directories... though seems to boot okay. Is it advisable to keep doing this? Or does OS X / macOS tend to get bloated with unnessary files etc over time?