I had a LBS also mention they had issues with the bitter coating of Duracell button batteries. Who knows.
As a 12 speed Di2 rim brake owner, I honestly don’t care one bit. It’s one less electronic I have to deal with while out riding. If the shifting stops working, I can troubleshoot a loose wire.
I don’t want an integrated cockpit, I want to be able to change my bars/stem/whatever whenever I damn well please. Bring on the shame!