It’s convenient that I can see all my text messages on all my devices, thanks to my iCloud account. I can get a text message on my iPhone and see it on my iPad, my iPod touch, or on either of my Macs. For example, it may be useful to see that Amazon text message thread–the one telling me that a package was shipped; then telling me that a package will be delivered today; then telling me that the package was delivered–on every single device. If I don’t have my phone handy, and I’m using my iPad or I’m working on my Mac, I can see a text message, and reply if I need to.
I’m a bit OCD about my Messages list. I don’t like the clutter of conversations I don’t need. It’s easier to find someone in your list if there’s not a long column of throwaway messages in the way, so I delete them when I’m finished with them. It’s not hard to do: on an iOS device, swipe to the left and tap Delete. On a Mac, hover over an avatar in Messages and click the x button.
The problem arises when you have multiple devices. You need to delete each conversation on each device.
Read the rest of the article on Macworld.