No, that's not actually reasonable given how federation works. You're not viewing content on other instance, you're viewing content imported from other instances. Copies hosted locally. This puts admins in the position of actively hosting content they may find objectionable if it's allowable on other sites and they're federating with those sites.

Your instance is not some neutral community browser for remote communities. It's not the equivalent of Chrome or Firefox. It's the equivalent of a website hosting guest authors, and the website admins are responsible on some level for what they choose to host.

If you want wide open freedom of choice, you have the ability to host your own instance. That's how you get carte blanch to decide what you see and what you don't.