Herman Bavinck discusses the development of Dogmatics (RD I.34-35). He says that with the Reformation, the practical side of the dogmatics started to shine through more. Dogmatics was concerned with “living for God through Christ, [and] religion, [and] the worship of God.” Modern liberalism pushed this too the extreme, and made it so faith was exclusively concerned with the practical, and without any fixed body of truths to norm it.
BTW NOTE: Reformed theology isn’t against being practical. It aims to keep a balance between theory and practice.