There's a lot to be said about the actual mission structure that people are managing better than me, so here's something a bit different:
Hosting being slaved to the person who owns the Railjack is a bit of a concern. I, for example, am slave to the terrible Canadian ISPs, and thus am an unsuitable host 90% of the time, but I'm also the person in my clan who completed work on my Railjack first, ahead of some of my more casual friends. We all enjoy being able to play together, but there are more suitable hosts that haven't constructed theirs yet. Them not being able to level up their crew skills is frustrating, yes, that's a problem that needs to be rectified somehow as well, but more importantly, the host and the Railjack owner shouldn't be slaved into being the same person.