Trade-offs in the default load-out, essentially - some of the things you want for games can bloat out the standard build, compromise the "license integrity" of the base repositories, make system instability more likely etc etc.

There is unlikely to be a time that "things stop moving" enough to make all these trade-offs go away, but you can pretty much just add all this stuff to the base distro yourself anyway if you want to (I still play games on vanilla Silverblue, for example).