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you will do that at least for basic templates such as landing page templates and mailing templates in order to select those while creating a local asset.
With local assets it's also easier to maintain the ovierview within a programs workflow cause they're mostly following the same naming conventions.
I'm also happy about even more arguments because I was wondering about the same topic before. 🙂
The Design Studio Tab was the only place you used to be able to build assets. With the launch of Programs you now can have a more advanced asset strategy. All the recommendations above are very good. The rule of thumb I suggest you follow is to consider the Design Studio tab your Global Asset Library and your programs as local assets. It is also the best/only place for your to store all of your templates!