That said, if you think that unit tests are always required, then I think that you are a victim of code complexity. Let me explain. I do believe that unit testing is good to master complexity, which often becomes out of hands with classical approches because the code is complex by itself (new lib versions popping up all the time, breaking refactoring). The thing with low-code is that it lowers that complexity by proposing more declarative approaches, which are more stable and less broken when changing versions (think of a static web page for instance, you don't really need to test it that bad although the browsers versions bump all the time).
I think that it is more important to be able to control complexity in order to avoid testing, rather than having to test "no matter what", like your reaction suggests. Plus, testing implies CI/CD and a lot of automation that are extremely complex to set up and consume a lot of resources.
I wrote a blog post about this stand-point lately https://cincheo.com/2021/10/03/when-low-code-meets-local-fir...
DISCLAIMER: I am currently working on a new low-code platform for frontend development based on the local-first paradigm. (web site: https://www.dlite.io, platform, with examples: https://plaform.dlite.io).