A great idea, and I think it could be exceptional if it handled effects and async in a robust way. The model almost matches Ember's new tracked reactive model and it's nice. I think the maintainers are working on BigTest right now, but the next focus is to give this library some love.
Still the kind of batteries included css frameworks, but generally people want to have some kind of framework backing with components at the center. If you aren't using components or a framework, this is a good bet.
Every ember app comes with this built in, and it's a great part of the workflow. Keeps your code from going in the wrong direction and promotes new best practices. Highly recommend it if you removed it or have a different setup.
One of those projects that makes you want to use it, because it has so many good components. I enjoy using EP but find the docs a bit sparse for my taste. I think Glimmer components are still a work in progress as well. Otherwise if you want material design in Ember, this is the addon for that.
I was wondering if this was still useful with fetch and all, but can easily say it is! Mainly because to build great software you need stateful ajax, where headers, base url, etc are defined at the app level. You can't do that with fetch.
V3 had been pretty unfinished for a while and maintainers are mostly unresponsive. There are even alternatives out now, people got tired waiting.
Big fan of this addon, since I install it in basically every app. It said a lot about it when Ember core decides to adopt most of it. I recommend this, and can say that it keeps up with the community.
There are better APIs for doing the same thing that this library does. It was great when it came out, but now a days i'd choose something else. Mainly due to some complex rules and not so clear method. Especially when you get into arrays and their items that are objects.
I'd have given this a 5 if there was easy ways to chain scripts. Like after ts rebuild also run another script. Beyond that this has been a regular go to for setting up a nice dev experience for ts projects.
This probably deserves more credit, especially now that people are using playwright more, due to making headless browsers a normal part of development. I've built a few screenshot and pdf apps and have had great success even for involved loading patterns.