These are supposedly peer reviewed journals, and some of the writing conventions, sentence structure, grammar, spelling etc is so terrible, I can’t believe it was actually peer reviewed.
If it was perhaps just one article I would assume it was somehow mistakenly published in a draft state by accident, but I discarded 3 articles thinking they were rubbish, now I’m reading another poorly written paper from a tech journal that has an impact factor of 7 and I am becoming confused by the persistent use of poor English across multiple journals.
I assume a lot of research in this space is done by people who are not native English speakers, and that some articles are translated maybe as well, but surely the peer review process would iron out some of the litany of errors that make these papers unpleasant to read a best?
I have read several thousand academic papers in my career. In general I don't find the quality of the writing to be as poor as you suggest. Which makes me question whether you are selecting the papers for technical quality.
My process is to read the abstract, look at the authors' affiliations and the references. Those three items give me a sense of how much weight to give the paper. Then I skim the paper, reading the method, results and conclusion. Only strong papers get a more careful reading. So, yes at that stage I might notice the quality of the actual writing. Understandably some international institutions may not have had access to competent English technical editors.
Most academic journals also don't have actual editors. Their editors are basically managers who facilitate the review process and make decisions on acceptance. Outside prestige journals such as Nature, authors are usually responsible for the final text.
But the point about readability is a good one. Papers are meant to communicate. Poor writing increases the friction readers experience, which diminishes communication.
The key problem is /peer/.
I.e. people no better :)