This is not true. The private api's we use are not hacks to work around macos spaces and are actually the basis of how appkit and the os in general works. They are essentially guaranteed to be stable and also not to be removed because they have been in use for many many years with no change.
The private api's that have been broken (as experienced by yabai) are strictly related to things that rift does not interact with like moving windows between macos spaces(since we use a virtual workspace system).
The private api's that have been broken (as experienced by yabai) are strictly related to things that rift does not interact with like moving windows between macos spaces(since we use a virtual workspace system).