There was this info once, that the API for the ps5 is the same as for ps4, meaning there is no need to change how game internals work, if you optimize for one, it's low effort for the other. Xbox introduced a new API with the new generation, giving new features, and requiring to do some things differently. So developers might run into situations, when a code for doing something is optimal for xone, ps4 and ps5, but xseries requires some differences.