Hi Camelot!
I have a number of people who simply dislike Google in general and Chrome as a browser. I had suggested that they use Chrome's built-in QR generator, and they objected to using Chrome, so I was looking at alternatives that didn't cost them $$ for a third-party QR generator.
Chrome does have a built-in QR Code generator. Basically, open the URL you want to point to with the QR Code. Then right-click in some open space on that page, and you will see "Create QR Code for this page" as an option. It is free and lets you point to whatever you can open in Chrome. Easy to use.
You are correct in that a QR code is "agnostic" as you described it. A QR will work on any browser and should be able to point to anything. Google's Chrome generator is just that. But some of the folks I work with just don't like Google or Chrome.
In using the Apple method for creating a QR Code, using their provided "shortcut", I found it would not work with anything but a top level web page. I tried to point the QR Code to a subordinate page that had an HTML extension in the name and got gibberish appearing on my screen. It worked fine on the top level of that page ending in a .com, however. Still not sure why, but it is one apple short of a full bushel in terms of being a good solution. Chrome's generator handles .html extensions just fine.
I could suggest folks use any of the "Free" QR Code generators, but they are not really free. They will let you do a minimal number of codes and then want $$ to continue. These folks are all artists, maybe not starving artists, but not living high on the hog either. So I was trying to keep this free for them. I also suggested using ChatGPT and other AI to create the QR Code. That is free and really easy to do. But you can imagine how artists feel about using AI for a variety of reasons.
Anyway. Hope that answers your questions about my question! Thanks for replying!!