I still think they should utilize assets they create newly for an expansion/patch better.
They did this a bit in BfA (Crucible of the Storm) and Legion (Trial of Valor) but none in SL. And even BfA and Legion weren't really doing this as they could.
Just release more 1-2boss raids (in .5 patches for example) using assets you already have in the open world, just creating an encounter. And maybe even do a pre-season at expansion start where there are maybe 3-4 bosses spread over a few mini raids tying up some plotlines in zones or moving cool scenes to them (my example always is how Ysera's death would've been much more epic in a 1 boss raid, they just needed to make her mechanics work for a group). Heck it can just have N and HC difficulty where HC drops equivalent to Normal of first season or maybe slightly lower. Nobody will be able to fully gear from this but a few pieces are nice and good variety.
And the ones I suggest in .5 patches maybe drop loot equivalent to last few bosses of that tier on same difficulty or like +3/4, or just have like effects or something. Like how putting an ending to SL leveling zone stories could be cool via a 1-2 boss raid each.
And then for dungeons, I have no idea why they ever stopped doing dungeon wings. Its a great way to create a couple dungeons without making much assets. When I initially saw 9.1 I was hoping we would be getting 2-3 dungeon wings based on torghast assets, with bosses from torghast as bosses there. Same again with ZM and sepulcher themed ones. Not all raids I guess would work perfectly with wings, but a lot can. Especially from the torghast assets they wouldn't need to create rooms or maps since they have them already a bunch (and honestly in 6 different styles...).
Hopefully DF won't stick to the template of BfA and SL of having a patch with raid and mega dungeon and then no other dungeons added. I would hope that by the time S3 comes to DF and we have went through all 8 DF dungeons in M+ but by then there were 4 more added in DF that are S3 M+ (like 2 pataches with 2 dungeons or 2 dungeons and 1 megadung split up). I also don't just want it to be just 3 or 4 long raids for the expansion, and after the first patch the leveling zones are no longer relevant. But somehow as much as I have faith in DF I'm not sure if this is gonna happen and they will probably just follow the template