That is the premise of Dombrowski's off-season though. They played at a 102-win pace from early June, having struggled in May while also missing Harper, Suarez, and getting nothing from Turner. At the deadline they rested on the laurels of Hoffman's emergence in the pen and Rojas's defense, knowing they couldn't catch Atlanta but also wouldn't miss the WC like almost happened in '22.
I don't necessarily agree with the premise either, but to me that is all the more reason to not sign a $30 million pitcher (and inch closer to dropping 10 places in the draft) who might take them from 90 wins to 93 wins. Because that still doesn't get you close to the Braves or Dodgers. Maybe if they'd signed Bellinger plus a pitcher (or a pitcher plus Chapman).
Sure, Montgomery would help in the World Series... just like he did last year when he was acquired by Texas at the deadline. Ditto Verlander and Tommy Pham and Paul Sewald, The Phillies have never acquired a top-line player at the deadline in the last two years (though Marsh was certainly as impactful as Pham). This could be the year to do that.
But, counter to AF's post, if they did get Monty, Suarez becomes your #4 starter and Walker/Sanchez fight it out. Montgomery's not your 5th or 4th.
The Phillies had - and still have - one of the best rotations in MLB (I believe it is ranked 4th this pre-season). Luck and health will always play a role in that of course.