When you work in multi language environment the squiggles are often less than useful. They are just visual noise I must fight or ignore because the system tries to guess the language of the text I'm writing and it is most often wrong. And manually switching language settings between each interaction is way to inconvenient.
I used character styles that set the proofing language with hot keys assigned, so shift-alt-1 sets to English, shift-alt-2 to German, etc. As character styles they apply both to the current insertion point when typing or any selected range (e.g. when I forgot to set it proactively and now have a line spattered with wiggles)
Or just set the proofing language for the entire text to None to banish all spelling and grammar diagnostics.
It's very odd to me how at my work's MS Dynamic 365 interface American-English spellings are red-underlined while British is not (e.g. color/gray but not colour/grey are underlined). The company is American-based and there are no dialect/country selections available.
At least in Firefox I can select multiple dictionaries. Firefox will ignore words that are a match in any of those languages, at the cost ofc, of typos that are in one language but not another so sometimes I'll right click and uncheck a language temporarily.
While your point is valid, I think you are missing the point of the article.
The point was that someone the author was fond of passed away. The author who likely might be reading these comments. And Krueger did some cool stuff that everyone use without realizing who did it.
You can disable language checks under the paragraph or character tab for the text item (I forget which). A little annoying but at least makes them go away.
On most systems I use I've managed to set it up so that I get spell checking in all languages I use. So I only get a red line if it's not a valid word in any of the languages, which is pretty useful.
