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Couple of features which are available only on Classic UI & Missing in Touch UI
Adobe making major investments in Touch UI but not in classic UI
Following are the common usage now
Touch SiteAdmin UI
Touch DamAdmin UI
Classic Authoring UI
Answers to your questions are
Make sure at least components working with Classic UI interface. I am sure engineering will find a way to reuse with less effort to move into touch ui for missing features.
Couple of features which are available only on Classic UI & Missing in Touch UI
Adobe making major investments in Touch UI but not in classic UI
Following are the common usage now
Touch SiteAdmin UI
Touch DamAdmin UI
Classic Authoring UI
Answers to your questions are
Make sure at least components working with Classic UI interface. I am sure engineering will find a way to reuse with less effort to move into touch ui for missing features.