Ring Doorbell Pro 2 wired directly to Ring transformer, do I need the Pro Power Kit V3?

Hello, I just had a Ring Doorbell Pro 2 installed at my home on a door that never had a doorbell (no existing chime). The doorbell was hardwired directly to the Ring transformer I had purchased. The electrician first installed the Pro Power Kit V3 with one cable going to the doorbell and the other to the transformer. This did not work and the doorbell was not receiving power. The electrician then removed the Pro Power Kit V3 and wired the doorbell directly to the transformer and it worked. My question is, do I need to have the Pro Power Kit V3 installed or is it not needed in this scenario? I've read articles about Ring transformers or the doorbells failing a few months later if the Pro Power Kit V3 was not installed. Can anyone help answer this?