It's understandable that a rigid rule of grammar would advise against it. It's called grammarly, not semanticly.
(To return the favour, "a is predominently singulair, it is grating to see it in collocation..." includes a comma splice and a misspelling — singulair.)
- Your sentence may be unclear or hard to follow. Consider rephrasing. (the suggested rephrasing makes no sense and is ungrammatical).
- Add a comma (the suggestion is to add a comma between "the" and "most" in the phrase "the most common")
- Choose a different word (the suggestion is to exchange "heavy" for "cumbersome" when the topic is the weight of steel chain).
- Variety (the suggestion is to swap "hooks" for "angles" when the topic is lifting hooks that attach to steel chains)
Plus, I regularly see crap such as in this image. I've no idea what it thinks it's doing.
https://i.postimg.cc/BvRfnfnP/image.png
Other oddities include Grammarly disagreeing with itself. I apply a suggestion, and then Grammarly flags its own change and suggests I change it back to the original or to something else.