I guess I was thinking of “special characters” like Ł, ñ, ă and such.

ruby shoes that are red

You mostly nailed it but this one would be “red ruby shoes”

determiner, quantity, opinion, size, physical quality, shape, age, colour, origin, material, type, and purpose

Special characters suck in on-screen keyboards

Not as much as they do on physical keyboards with their “hold alt-gr and hope” approach.

https://freemusicarchive.org/music/R_Stevie_Moore_with_Irwin_Chusid/Swingin_Singles/csr044_swingin-singles_side-b_08_r-stevie-moore-with-irwin-chusid_so-be-it-soviet_the-undertow

Not true at all. (I see someone else already mentioned it but…)

I love mazes that intentionally defeat this method.

You mis-spelled “to-day”.

I only use it incidentally but my biggest gripe is the total inability to perform its one function of teleconferencing.

The bit where it lags the audio badly and then speeds it up to catch back up to real-time is absolutely infuriating to listen to, and such a failure of a tool that had. one. job.

This isn’t exactly true. Barcodes can contain almost any Unicode string and some other things besides.

What you are talking about is the EAN (European Article Number). The rest is mostly accurate, but applies regardless of whether there is a barcode to go with the number.