Ps players have had the next gen version for a few months. Maybe 'marketing' has something to do with that decision.
if you know the devs, it's more like them being super slow once again. they are notoriously slow with updates, which is also why there is no crossplay or crossprogression yet. they still can't manage to release updates simultaniously on all platforms. usually PC is first, then XBox and PlayStation (usually simultaniously/very close to eachother, but this was a completely new port, hence the different release times) and Switch in last.
I have no idea why they don't just release Updates when they're ready on all platforms. maybe because they fear PC fanboy dipshits would complain that the console versions hold back the PC patches? but crossplay + progression would be worth it for many I bet.
but the next gen update really is nice, the game looks way more polished now and the loading on SX is fucking lightning fast. loading into Plains of Eidolon is less than 2-3 sec when it was about a minute or so on One X