I don't see how that position is supported.
- You've got storyteller mandate.
- You've got find the fun mandate.
- You've got Rulings Not Rules.
- You've got change/ignore the rules in order to fit the needs of the table in several different places in the text (this is straight White Wolf Golden Rule).
- You've got GM-facing, GM-decides action resolution without encoded DCs or procedures to arrive at them.
- You've got Ignoring the Dice section canvassing that no GM is actually neutral and will be prone to cognitive bias.
- You've got the section on fudging dice rolls on 235 (why a GM should do it...when they would...how they should - through illusionism via GM-facing action resolution and doing it deftly and strategically).
- You've got the legacy of this stuff deeply embedded in the D&D zeitgeist from the late 80s onward of AD&D2e, 3.x, Adventure Paths (exactly the sort of players they were working to regain).
- You've got 5e Adventure Paths that don't just support it, but advocate for it in certain places.
I know you and a few others believe this. But I don't see how the totality of the evidence is on your side. Not in the text...not in the macro play culture...not in the testimonials. The evidence is robust. The Immersive Storytelling Style of Play on page 34 is basically cribbed whole hog from White Wolf and the game supports this from many different directions.
And players who play like this shouldn't feel ashamed. They should embrace it. Own it. Openly discuss how to be better at it. It is absolutely a part of D&D's legacy (probably the biggest part at this point) and its fundamentally wired into 5e.
Now 5e can be drifted to not have any of this stuff (everything is table-facing...Skilled Play is the apex priority of play...GMs have made the rules as explicit as possible and they're constantly following those rules to a T)...but its absolutely enabled at every level of design and implementation (from broad ethos, to GMing principles, to GM latitude, to action resolution, to the top down Adventuring Day design vs the Bottom Up balancing at the Encounter level which makes the game less sensitive to a Long Rest recharge).