The often overlooked selling point of Deno that I find most compelling is the (re)use of web APIs. As a full-stack dev writing isomorphic code and libraries, dealing with ideosincracies of nodejs has been a pain.
When Node first released its biggest selling point was being able to reuse web APIs. It also filled in gaps for APIs that weren't standard in browsers. Then browsers started to add these APIs, and some of Node's implementations naturally diverged (aka the idiosyncrasies that you mention). Deno has the advantage that they are starting from a clean slate without the burden of legacy APIs, but how long will that hold fo…
Either way, if Deno is one day replaced by something else, say 'Done' to keep the naming convention, that won't refute the use everyone will have gotten out of Deno in the mean time, in the same way that Deno doesn't refute the use everyone has already gotten out of Node.