Look, you can insist that a 1440p monitor can only show blurry text all you like, but the problem that people are talking about is that the text is even blurrier than that.
I have native 1440p 120Hz on my main screen which is more than 30inches across (ultrawide). I can see pixels if I look close enough, but I do not see any pixels at usual reading distance.
I have used retina displays of various sizes -- but after a while I just set them down to half their resolution usually (i.e. I do not use the 200% scaling from the OS, rather set them to be 1440p (or lower on 13inch laptops)). I have not seen an advantage to retina displays.
Text on 1440p looks great with full hinting and subpixel rendering. Unfortunately, macOS does neither, so the jump to retina feels more significant than it is.
Biggest draw for me with 1440p 32" is being the same DPI as a 1080p 24". I like to have one big monitor and then 2 small flank vertical monitors and having them all be the same DPI just makes headaches go away on every operating system I use them with.