I get why people would want to push this forward in general, but except in a case down the road, many years from now, is there a real case right now for running your typescript code without compiling it?

Maybe library compatibility?

My first reaction is that this just further fractures the ecosystem, where some codebases/libraries will have TS that is required to be compiled and some will not, adding a third kind of TS/JS code that's out there.