That may be a plus for code editing, for example pgup/pgdown moving the cursor instead of just the view...
You personally list this particular (mis)behavior as a "plus" since you like the PC convention better. But another person will think the opposite. Objectively, it's simply just inconsistent.
What we need is "good platform citizen" apps which respect the local conventions, and you as the user get to choose the platform with its set of conventions you prefer.
What we DON'T need is apps "unifying" behavior across operating systems based on their own opinion of what's better, ultimately just creating more mess.
Many of us on the Mac are there in part because the environment and conventions make more sense to us than the conventions on other platforms. X-platform apps typically ignore this.
See also
https://daringfireball.net/linked/2020/03/20/mac-assed-mac-a...
However for keyboard shortcuts said conventions are defined for crippled keyboards without dedicated navigation keys and the extension for PgUp/Down is simply inefficient when programming.
Up / Down: move cursor one line up or down Left / Right: move cursor one character left or right
Option+ Up / Down: Move cursor up or down a whole paragraph Left / Right: move cursor left or right a whole word
Command+ Up / Down: Move cursor to the beginning of the document Left / Right: Move cursor to the beginning or end of the document
Page Up / Page Down: Move the scrolled display area up or down a "page" without moving the cursor
Home / End: Move the scrolled display area to the beginning or end of the document
The latter two are nice to have because it means you can scroll up through a window to view something, and start typing to have your view snap back to your cursor position.
I don't think they ever had PgUp and PgDown. Same thin/small fetish as today. Jobs wasn't typing much, I think.
Apple Extended Keyboard M0115 (1987): https://en.wikipedia.org/wiki/File:Apple_Extended_Keyboard_M...
Apple Extended Keyboard II M0312/M3501 (1990): https://en.wikipedia.org/wiki/File:Apple_Extended_Keyboard.j...
Apple Adjustable Keyboard M1242 (1993): https://en.wikipedia.org/wiki/File:Apple_Adjustable_Keyboard...
Apple Design Keyboard M2980 (1994): https://en.wikipedia.org/wiki/File:AppleDesign_Keyboard_blac...
Apple USB Keyboard M2453 (1998) (not in their usual position, above the number pad instead): https://en.wikipedia.org/wiki/File:Apple_USB_Keyboard_B.jpg / https://deskthority.net/wiki/Apple_USB_Keyboard
Apple Pro Keyboard M7803 (2000): https://en.wikipedia.org/wiki/File:Apple_Pro_Keyboard_black....
Apple Keyboard A1048 (2003): https://en.wikipedia.org/wiki/File:Apple_Keyboard_(A1048).jp...
Apple Keyboard A1243 (2007): https://en.wikipedia.org/wiki/File:Apple_iMac_Keyboard_A1243...
Apple Magic Keyboard w/ Numeric Keypad A1843 (2017): https://en.wikipedia.org/wiki/File:Apple_Magic_Keyboard_with...
Additionally at least as far back as the Powerbook G3 "Wallstreet" in 1998, and including the iBook lines from the same time period, to the best of my knowledge every Apple portable since (as well as any wireless/compact keyboards with Fn keys) then has supported Fn + Left/Right for Home/End respectively and Fn + Up/Down for Page Up / Page Down respectively. They were even marked as such through the early non-unibody MBPs but continue to function that way today even without the markings. While these aren't dedicated keys, they're convenient enough in combination with the other modifiers that you'd be using to move the cursor that I don't personally consider it a significant difference.
Answer 2: I bought a general purpose computing device and I don’t need the manufacturer to dictate how I use it.