[Suicide Junkie]

It has been this way for a long time. You've gotta build the planets before putting up the Dyson Sphere.

IMO, you should still be able to (re)form planets with a ring or sphere covering your star, since you could leave "windows" in your construct for the planets outside.

Actually building the sphere would realistically require the use of all the planets in the system, but since the planets stay in SE4, not being able to reform them is the price you pay.