The language itself does not change much, but the std does. It depends on individuals, but some people rely less on the std, some copy the old code that they still need.

> Are there cases where packages you may use fall behind the language?

Using third party packages is quite problematic yes. I don't recommend using them too much personally, unless you want to make more work for yourself.

Zig 0.15 is pretty stable. The biggest issue I face daily are silent compiler errors (SIGBUS) for trivial things, e.g. a typo in an import path. I've yet to find exactly why this [only sometimes] causes such a crash, but they're a real pain to figure out over a large changeset. `zig ast-check` sometimes catches the error, else Claude's pretty good at spotting where I accidentally re-used a variable name (again, 90% of the time I do that, it's an easy error, but the other 10%, I get a message-less compiler crash). It sounds like the changes in the OP might be specifically addressing these types of issues.

Also, my .zig-cache is currently at 173GB, which causes some issues on the small Linux ARM VPS I test with.

As for upgrades. I upgraded lightpanda to 0.14 then 0.15 and it was fine. I think for lightpanda, the 0.16 changes might not be too bad, with the only potential issue coming from our use of libcurl and our small websocket server (for CDP connections). Those layers are relatively isolated / abstracted, so I'm hopeful.

As a library developer, I've given up following / tracking 0.16. For one, the change don't resonate with me, and for another, it's changing far too fast. I don't think anyone expects 0.16 support in a library right now. I've gotten PRs for my "dev" branches from a few brave souls and everyone seems happy with that arrangement.