That’s certainly true in general. I’ve made that argument numerous time on here. That’s why the USCG has proposed changes to the regulations:
Electronic Chart and Navigational Equipment Carriage Requirements
the Coast Guard’s broad strategy to revise its CFR chart and navigational equipment carriage requirements to implement statutory electronic-chart-use provisions for commercial U.S.-flagged vessels and certain foreign-flagged vessels operating in the waters of the United States.
That said, even with two ECDIS in the wheelhouse (in addition to other screens), in some situations it’s still sometimes helpful to have a paper chart spread out on the chart table for an overview / planning.