Consider this: you're up against millennia of development in writing and typography. People have tried a lot of different ways of organizing and presenting text. And I mean a lot. Different symbols, different fonts, different page layouts, different text orientations. There was even a long line of symbols spiraling on a disk, getting denser as it approaches the center. There's a good chance somebody tried different ways of aligning long text in a paragraph. And we settled on one. Maybe there was even a good reason for it. It's consistent across cultures too. Justified and centered text aside, left-to-right languages are flushed to the left; right-to-left languages are flushed to the right.
Is it objectively the best way? I don't know.
Writing, fundamentally, is used to communicate your thoughts - to yourself or to others. Publishing your writing on the web (and sharing it here) implies you want others to read it. In order to reach your readers, you want to make it easy for them to parse this text. Over the years, people developed a set of patterns that make text more readable. Some are fundamental. Some are nice to have. Some are so universal they are expected - and noted when they are missing.
Think about why left-to-right languages are left-justified.
It's because when you're writing by hand, you can't possibly know in advance exactly how long the line is going to be, so you have to start at the beginning and write until space runs out.
But now we have computers. We no longer write by hand. It's trivial to have the computer justify text however we wish.
So now we ask the same question again, which way should we justify text now that it is trivial to do it either way? To me, "do it the way it's always been done without question" is a non-answer that leads to exactly no evolution whatsoever.
Right but someone doing something different alone doesn't typically mean it is a better way. For every new better way there are an infinite number of new worse ways
