Believers also partake of the heavenly, that is, the spiritual. We not only test it, it tests us! Rather than some big fluke with no meaning, as so called science preaches, we have tests for a reason.
By 'taste and see' that He is good, and doesn't mean just eat apple pie. Being born of the spirit is not a physical activity. Yet in all these things and more we feel the results. To change an old building, we send in physical workers. Not so for our earthly home, the real us that dwells inside our body. That takes something spiritual to fix.
Yet, the people fleeing slavery in Egypt ate real food. That was one way of 'interrogating' the word of God. Same with the thousands and thousands of people that ate the loaves and fish. Same with the multitudes that were totally healed. They had physical proof. Same with those raised from the dead. Same with the people crossing the sea, when God parted it. Etc etc. The bible is an ancient roadmap, full of proofs along the way. Jesus doesn't set the calendar, and affect the rise or fall of nations, and have billions of impacted lives. Not impacted with a sugar pill or imagination either.