I think we are a victim of behavioural norms and so many of the apps that I use have this pattern. That's not to say it's the right behaviour, but it may be hard to break the pattern for users.

Economists explain that markets work bestwith “perfect information.” And visibilityfeeds this market by translating and sharingskills. But the price of transparency in themodern age is invaded privacy, as well as biasinherent in automated products and services

You should default to the most permissive option imo and there really is no reason to check anything until you really need to If it were left to me I'd just use optional chaining, as it also eliminates the need for no-ops

new style RFC

What if MobX did make assumptions on how your data is structured? What if it is opinionated? That is the curious case of Mobx state tree.