Using Yii2 with Angular

I am just wondering If we use Yii2 with Angular doesn’t that leave us at disadvantage due to Yii2 contains alot of features and Validation stuff.

Also, can we use Yii3 with new applications for Frontend frameworks or is it risky to do that?

Yii2 is fine. Just create REST API to serve your backend. You can ignore the rest.
Yii3 should be fine for released packages. So it depends on what you want to use to build your app with.

If you ask me, I will suggest Yii3 if it is a new project and you have time to learn a little bit of Yii3, otherwise stick with Yii2

Yii2 rest api is a great starting point, then you can override methods as needed.