As a Demandware developer who has worked on Salesforce integrations, this makes me nervous.
why? I think this is the right move for Salesforce.
Because every time that I've had to deal with the exchange of data to and from Salesforce it has been a massive headache. I also would strongly prefer to see Demandware stick to their agenda of using modern Javascript as a backend language that powers the platform, but now I worry that's going to either stall or be adjusted to use something else.