We are about to start our estate wide deployment of 25H2, been through testing phases over the last few months. Mainly from 24H2 to 25H2, but some devices are still stuck on 23H2 due to them not having enough disk space, needing 30-40Gb in some cases!

So we're expecting the same issues when 25H2 is aimed at them. 24H2>25H2 is an enablement package (tiny), but 23H2>25H2 is a sizeable upgrade. We're expecting freespace issues to be the main challenge again. 

Hope that helps