> Which is the third possibility that you consider non-silly?
Grouping separators include space (that's the SI style, using either comma or period as decimal separator), apostrophe and "˙" (DOT ABOVE). A few locales also use "·" (MIDDLE DOT) as decimal separators.
Many modern languages allow interspersing "_" in numbers which replaces spaces for grouping.
My basic gist is that
a) Using dot and comma provokes mistakes, thus I call it "silly".
b) Deviating from the dot as decimal mark in the context of computers is a bad idea™, because it violates a de facto standard in computing and introduces a myriad of regional conflicts without any benefit whatsoever.
Huh? From what I've seen across the world, it's either "commas for decimals marks and periods for 3-digit group delimiter", or the inverse ("periods for decimal mark and commas for 3-digit group delimiter").
I can understand finding one or the other "silly" (depending on what you are accustomed to), but you seem to find both of these combinations silly.
Which is the third possibility that you consider non-silly?
(Note: reading again, you seem to imply the apostrophe for groups and period for decimal mark is the best option. It might be, but is it used anywhere outside of Germany?)