I'm an old 40-something guy and I have played through Wildlands probably a half dozen times now. I really don't mind the AI teammates.
The missions are "varied" enough for me to try to tackle them in different ways, HALO, stealth, guns blazing, sniping only etc.
Some of the unidad bases are a challenge for sure.
I was bummed when I first learned Breakpoint removed the AI teammates. Despites the devs promises to include them, I don't think it will happen.
I wish they'd take this engine and gameplay to Syria, North Korea, or some former soviet bloc Balkan country.