I think it because they will never allow Peter Parker to grow up. In every film, he never seems to progress towards adulthood.
Which is a shame because the original material of Peter Parker is that he's a science genius at the level of a Tony Stark / Reed Richards. So he's like the ground level version of them. The movies always make him out to be a bumbling awkward teenager. The recent PS4 Spider-Man game totally gets Peter Parker right, bang on. Wish they could take their lead from that version in the cinematic world.
There are "smartest man in the room" references in Far From Home so maybe that are heading that way.
If you really want a grown-up Spiderman then into the Spiderverse has you covered. Multiple times over.