It is a relatively high volume production operation compared to Nimbl, EC, etc and this model is a big step for them into a new type of RV. They are trying out new components and suppliers in many areas with the EKKO and not taking on new stuff in other areas. Propane is tried and true and Truma has been a good partner so they didn’t innovate much in that area and avoided risks of new designs and suppliers in the heating, hot water, and cooktop. They are going to be investing a lot in what will probably be a very popular new RV and it’s reputation would be tarnished by problems in what should be low risk components. When their customers get the bug for removing propane they will respond, that is probably not a big demand at the moment.Other than inertia, I just don't get why they stick with propane.
Also, Winnebago has designed the EKKO to be easy to modify by customers since they are seeing this as a trend with the Revel customers. They seem to be pretty good in the Class B market segment in responding to customers feedback and the EKKO is really an extension of what they started with the Revel where they addressed customers desires for a more rugged Class B and saw that it created a big aftermarket for upgrades. For a high volume manufacturer they are doing pretty well at moving into a new market.