Exactly.

Steemit turned into trashflood because it has serious flaw in business model which was exploited by many.

Any discrepancy in effort/profit creates some kind of spam. In terms of effort, that means quality can be easily overrun by junk posting and self-upvoting.

You can clearly see it. Many people here can't write meaningful English sentence, their posts are impossible to read,yet they are extremly popular. 

I understand there are people which are not native English speakers, their native language is really different from English (thus being unintuitive to learn), they didn't have good English teachers or started learning at high age by themself. Or they just lack talent for languages.

I myself am pretty bad at English (was quite good but my skills went downhill since highschool as the online communication didn't require strict grammar/syntax).

But I'm not text content creator. And if you like to be one, your English has to be good to succeed in real online business.
On Steemit, it doesn't matter. You can succeed with automated upvotes.