I call them the "Lesser Countries". You can tell them, the comma war is coming.

I tend to follow the trend of more intelligent individuals, like the 19 and 20th century mathematicians.

As well, more intelligent modern individuals at least follow the basic rules of the International System of Units.

In practice, the decimal point is used in English-speaking countries and most of Asia, and the comma in most of Latin America and in continental European countries.

If you're speaking/typing English, use the proper methods.

Punctuation has nothing to do with digit separators and decimal points. Language =/= Math

Currency is a separate monetary system based on capital. Not like cavemen had dollars. Shells are badass.

Measuring systems are inherently interchangeable/convertible and some are better used for different functions, especially situations where you have to do it all in your head.

Driving on the left/right side of the road was originally determined by the quality available of wagons/coaches (yes before cars). High-quality Conestoga wagons introduced in the 1700s which spread like wildfire had handbrakes on the left rear wheel and in order to see other drivers on the road changed from driving on the left (yes we drove on the left first) to the right. We did all this before some countries that drive on the left even had roads that could handle wagon travel.

...no formal rule of the road was adopted by the new country or any State until 1792. In that year, Pennsylvania adopted legislation to establish a turnpike from Lancaster to Philadelphia. The charter legislation provided that travel would be on the right hand side of the turnpike. New York, in 1804, became the first State to prescribe right hand travel on all public highways. By the Civil War, right hand travel was followed in every State.
https://www.fhwa.dot.gov/infrastructure/right.cfm

The Model T Ford was also only exported right-handed, purposefully to help convert those living in the past.
Concerning modern day, less than 9% of the planet is left-handed, so why drive in cars on roads oriented for left-handed people [originally done so out of a lack of better/easier technology]? That's one thing I'll never understand. You ever drove a car built for driving on the left? I feel less safe operating the damn thing because I'm right-handed so I prefer a car made for being right-handed. Shifting is uncomfortable and operating anything on the center console with my offhand makes driving a lot less safe.

Really though, what's the point of writing numbers like this: 1'234'567,89 (Yeah I'm talking to you Switzerland!) [EDIT: I guess according to the Swiss government "this usage is officially discouraged" so even their own government realizes it's people were being stupid trying to be edgy and throw commas everywhere]
And you know they try to call an apostrophe a damn "upper comma" wtf is up with that?

Edit: added note about Swiss govt.