I don't see it that way - if anything I wish publishers/devs wouldn't advertise their games until they are close to release. See Bethesda - they tend to keep things to themselves until the game is at "coming together" point.
I don't know how old Obsidian acted - unless you mean crowdfunding Obsidian, which is a very different thing. We are not source of fuding during development so Obs can focus on making the game, rather then keeping fans engaged throughout the development process. They are also in the position to do course corrections - something that PoE1&2 would greatly benefit from. I don't remember hearing much about other not-crowdfunded Obsidian games - especially Outer Worlds were roumored for a long time before being shown. And Avowed is larger still.
Another thing is, that games like Avowed, Fable and Hellblade2 have a lot of importance to Microsoft - those will be first big budget productions made under Microsoft umbrella. A nieche unfinished cult classic just won't cut it. So far with Psychonauts2, Redfall, Starfield Microsoft didn't flinch from giving teams more dev time. I just hope everything is going alright there, as I really, really, really want Avowed to be good.