I really dislike this camp thing of "musk haters" and "musk devotees".
I mean, governments backing the project lends it credibility to a certain extent, but not really since governments often contract for dumbass shit that doesn't work. See the US Defense Department and shit like Star Wars or...I can't remember the name of the helicopter program that was never going to be feasible.
Right now, based on everything I've read, it really
isn't feasible. The tech still has a ways to go and even then the limitations may prove insurmountable (what if they can't get the rights to the land they need for a route and there are no alternatives because this shit can't turn on the dime?). It may prove fruitful in developing similar tech that's more flexible, but as-is it's kinda a pipe dream.
https://www.wired.com/story/guide-hyperloop/
It's a bit older at this point, but Wired has a pretty good explainer on why it's not all as easy (especially the non-engineering related problems, which still remain) as Musk and the people with a financial interest in getting paid to develop a hyperloop system say.