I feel like Spielberg has become a very subpar director since 2005. Great from prior to that point but really downhill after.
I don't think so. I think he is branching out a bit and doing different things that may or may not have subpar his typical level of scripts (i.e. Ready Player One).
But RPO was still good, Bridge of Spies was really good, Lincoln was good. I never saw BFG, War Horse, or Adventures of Tintin.
Are any of them classics? Idk, time will tell. I doubt it, but not all of Spielbergs movie before will be either. When I think of Spielberg and classics, I think of Jaws, Jurassic Park, Saving Private Ryan, and Catch Me if You Can. That's about it, but that's me. I am sure some others will throw in Temple of Doom, E.T., The Color Purple, etc...
Anyway, I don't think he has declined. He is still a top notch director. I do think his time is winding down, but that is more due to his age (74) than anything else.