Why? Plenty of boosters re-enter uncontrolled and burn up all the time.
Getting to orbit requires at least one more burn near the apogee of the original orbit to circularize it and ensure the spacecraft doesn't approach the atmosphere again. Starship didn't do the apogee burn they intended to do, so didn't demonstrate this capability.
The Saturn V went direct to Earth orbit without requiring relighting the third stage engine.
Small second stages and spacecrafts can be allowed uncontrolled orbital reentries because they usually burn-up. Starship is too big for that, debris would rain like when Space Shuttle Columbia disintegrated over land. They most likely will need to show engine relight capability to control reentry point before going orbital.
> This requires an engine relight in orbit.
The latter is part of the test at this point of development
It's made of 4mm thick steel sheets, and the FAA disagrees with you.