Indeed no reason not to have purple voxels or XS space fuel tanks. That's why people have been asking for them for years, just like they've been asking for many other things for years. It's bad enough that it had to take this long.
The real problem is when purple voxels are the highlight of new features, introduced with much fanfare and the only positive thing of note in recent memory, in an otherwise barren wasteland of a crippled "game" that nobody wants to play.