Enjoy it while you can. Realize though that being "employee #1" and wearing all the hats while working with others that "share your values" means they probably think they themselves are "employee #1" and wearing all the hats, which obviously can't be the case in a well functioning team.

I'd hate to see how that works in a large project - like SpaceX where teams have to build things.

IOW, consider you may be better off running your own show while you have this drive. And realize you'll want to hire the best and brightest regardless of their WLB preferences.

Currently it sounds like all the effort you are spending is in service to someone else's vision, and it better have equity involvement on your part because you WILL get interested in other things and unless you've built a war chest for your own ambitions, your work will be for nothing when you inevitably walk away - hopefully to do you own thing.

Don't make the mistake that your employer has your long-term interest in mind. It's not personal, it's just business. It's always what have you done for me lately