But I don't think it's safe to use an outdated version of software, especially if it's a piece of software which is targetted by scammers to steal the most valuable asset of the planet right now.
I won't use that version, don't worry, I was just curious! As we are more and more talking about satoshis, especially because of the Lightning Network, I find this topic fascinating.
I like that Satoshi even thought of changing the decimal convention :
Eventually at most only 21 million coins for 6.8 billion people in the world if it really gets huge.
But don't worry, there are another 6 decimal places that aren't shown, for a total of 8 decimal places internally. It shows 1.00 but internally it's 1.00000000. If there's massive deflation in the future, the software could show more decimal places.
If it gets tiresome working with small numbers, we could change where the display shows the decimal point. Same amount of money, just different convention for where the ","'s and "."'s go. e.g. moving the decimal place 3 places would mean if you had 1.00000 before, now it shows it as 1,000.00.
Thank you everyone for your answers.