A thing I've been noticing is that PaaS companies (e.g. Netlify, Cloudflare, Heroku) are shipping tools that let you test locally on your own machine. The experience is unmatched. I'd bet it's what led Google to (attempt to) do the same thing for Firebase, although I've noticed as well that their emulation is still off.

Overall, I hope this is a trend that continues. The fact that these things are sometimes baked into their clients, which are usually freely licensed and developed in the open, available for patching, is something that hugely eliminates some of the lock-in risk associated with building on top of platforms. Worst case scenario? The company either goes out of business, deprecates some corner of its platform that you're relying on, or becomes prohibitively expensive to use, so you spin up a VPS and daemonize the client. This doesn't work for large projects, but for anything that is relatively small (but not so small as to characterize the development costs as trivial), it's sufficient.