Position of Appian in the existing application development landschap

We intend to incorporate Appian into our existing application (development) landscape. Now questions pop up like what do we do with it and what don't we do in the application development area.
In terms of application development now more focused on .Net/C# and a few apps on the MS power platform. Adding Appian means additional exploitation costs, investment in knowledge and employees.
In terms of application development, should we now focus entirely on Appian and phase out the rest?

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