I'd rather them focus on one dungeon at a time as those are the ones I feel that really push design out.

Skalla, Swallow's Compass, and Ghimlyt were all really great due to their setpieces and bosses (Swallow's Compass especially). So to have them focus on just one really enjoyable dungeon instead of half assing two using existing assets (like how St Moc is just more brown).

It does suck because we are going to miss out on more music variety (which is a big reason I enjoyed the two dungeons at launch), but I'm willing to live with it if it means the dungeons are intricate. Considering how great this new one looks (Gpose heaven) I'm excited to see it.

Also a big factor I'm not seeing brought up is Gear. Both the dungeons in 4.2 and 4.4 reused older gear sets (Valerian and Filibuster) and people called them out hard on it (mainly for 4.4). I'd hope with this we instead get exclusively designed gear just like how Grand Cosmos has so we have a reason to keep running them past that point. This should also help with the cycle of gear constantly being reissued as new ways like the Ishgard Restoration allow us to use certain gear naturally for every job.