After I finally completed a playthrough I feel comfortable saying there is as much or more content than any previous Bethesda games.
How so? There is the main Constelation questline, 4 faction questlines, a couple of questlines in cities (like the Akila one about predators or New Atlantis about a tree) and a number of minor missions, which aren't really well developed, mostly fetch quests. Oh, and some random encounters. Outside of that it's mostly board missions, which are radiant quests.
i'm nearing 76 hours and the final mission of the game and feel like I've done 95% of the handcrafted content (while lacking the patience/willpower to continue searching for the remaining 5%) of which only UFC and Crimson Fleet quests were actually good. Oh, and this one mission in the main questline where you explore a reseach station jumping between its two versions in parallel realities. That was cool too.
I remember Morrowind and Skyrim having much more content. And at least Morrowind had quests and story of higher quality too.
And it is all handcrafted (unfortunately, a lost opportunity to really lean into procgen).
The problem with procgen is it is very soulless and unrewarding. Each time I found some quest dispenser starting to give me randomized radiant quests in procgen locations I always bid him farewell.