Is it a balancing issue to use "Nether Star Seeds" to produce "Nether Star" in "Phytogenic Isolator" without the need for a corresponding core to operate?

The same issue exists for Allthemodium, Vibranium, and Unobtainium, all of which should need Magical Soil to grow.

The same issue exists for Allthemodium, Vibranium, and Unobtainium, all of which should need Magical Soil to grow.

Yes, it is easy to produce and highly efficient. I think it disrupts balance like the previous watermelon generator.

The same issue exists for Allthemodium, Vibranium, and Unobtainium, all of which should need Magical Soil to grow.

Yes, it is easy to produce and highly efficient. I think it disrupts balance like the previous watermelon generator.

The key issue is that it does not require magical soil or core

It isn't possible to add soils to an Insolator. This is behaving as expected.