I don't disagree - there's no way of really having a crystal clear, black and white answer on this matter. However, I do believe the stats suggest lineup protection isn't a thing. I do struggle with that having played baseball for the past 30+ years myself. If I had some shitbag hitting behind me, pitchers would pitch around me more and I would try to expand a bit, knowing the guy behind me sucks.
Also - there's a difference between pressing at the plate and changing your approach based on lineup protection. You can be pressing at the plate with a superstar behind you - example, Bichette, Bo.