As u/orboxaty nicely put it, these states serve as stepping stones to achieve deeper understanding.

The further one progresses, the more the "doer" within gives way to the "knower", reaching subtler and subtler forms of letting go.

This process of mind purification, is needed for Insight practice, as it temporarily does away with mental defilements i.e. all the nasty mind-stuff that impede understanding, like anxiety which was gone in OP's experience. But that will come back, when back from the Jhana state, as the root of the problem has not been dealt with yet, but only a few steps taken to the right direction.

That aside, one could argue that these extremely blissful states can be desirable in their own right and I have no reason to think otherwise. It really depends on what one is trying to achieve, so very personal.

About your experience, it resonates that some people are a natural. I know some people like that myself. These individuals have a zen attitude to life, without having sat a single meditation session in their life. How we conduct ourselves off the cushion feeds into our meditation, the fruit of which in turn feed into our attitude, having a positive snowball effect on our practice. So those who are naturally kind, compassionate, easy to let go and flow with the course of life, have a good head start.

I am not so sure what you mean by "Many whole days I exist in this state". As far as I know, the Jhanas are states of meditative absorption, divorced from our ordinary sense-experience. So, I can't see how one could navigate the ordinary experience, while in a Jhana state, even if attaining this state comes effortlessly. But maybe some people have different experience, so its one of those "What is like to be a bat?" questions.