I mean it is an issue of management and cost. The management has recognized that the fanbase will stick around for the bare minimum for the first 3 months regardless. Those who stick around longer or return will not mind the specific content checklist that has been in place for a while. Seasons are effective marketing for big spikes of 1-3-6 month subs that remain dead until the next season.
A team that is dedicated to EK and Kalimdor would be too expensive and while it is very surprising to see them not utilize Timewalking for 10.0 with a massive revamp with the 20K+ DisplayIDs that are left unused that could be put on a vendor for free engagement. I mean, they may just be too crunched in their current position to have any resources beyond getting Dragonflight out the door, collect the shipped game bonus and fucking off leaving a Shadowlands scenario available for us to go through once more and since the community are totally okay with the concept of "Cut & Run". It may occur once again with full acceptance from everyone.