Oh now we’ve deviated into “to file or not to file” defects. and that is a hill I will plant myself upon and take on all comers unto the bloody bitter end. The last thing I ever want any of my QA to do, especially people new to the discipline, is to second guess whether or not a defect is “worth” reporting. For one, inexperienced testers dont have that very thing, the experience, to make that call. Secondly, few things will get me banging my shoe on the desk like “Oh yeah…I saw that defect a week ago” as I or someone else is creating that very defect report. Thirdly, I have often had a minor defect lead straight into a much larger issue hiding behind it.
There isnt a hard, fast, rule that applies universally. As noted, it depends on the state of development. We can also find ourselves facing a “target rich environment” and have multiple bugs in our sights at once. one might make a note to themselves privately when facing that to bookmark what seems to be the lower pri/sev items and dive into the defects that look to be uglier - I can always come back to that malformed JPEG logo later, right?. And for sure engage in “fencing” with the developer. No not the swords, but rather fencing off areas where the testing is open season through discussion with the developer. Developers also love to tell QA about areas where they have concerns…listen to em!