Note that, despite its age, this Photoshop version will absolutely cover all of your needs in terms of app development.
You'll be able to create very professional and pixel-perfect graphics with ease.
Right, it's been free for ages but it's missing a lot compared to CS6 and you'll get a lot of files where content gets rasterized becaused it can't deal with it.
but for the regular copy, paste, crop and alot of other nifty stuff it's more than enough as you mentioned. (pretty costly gift )
if you work with designers you might get what I mentioned above even with CS6 as they might use CC.