I don't like when someone from the outside the team try to dictate their design on my system. But, sometimes it is good the get new perspective and new ideas on the way things should be done. Especially if you encounter issues in your current design (scalability and security come to mind). If current design is working for you and your clients, there is no reason to change just because there are cooler toys these days. If you find yourself in too many problems and your current technology lags behind, consider starting from scratch having all the knowledge from the old system instead of trying to modify current code base (nice in theory, but most of the times no practical for time, money and resources available).