I receieved an INDD from @mtcte and found that, as they reported, they have a paragraph set up with right-to-left paragraph direction and the Adobe Paragraph Composer active, which should technically be impossible. I was able to reset the settings with the tools in my English (Arabic) install. Frankly, anyone could have - by making a new paragraph style that wasn’t corrupted with right-to-left behaviors, and applying it.
And, as an aside - while it’s totally the case that you can handle some Hebrew in plain-vanilla English InDesign, there are times when it’s nice to be able to reverse paragraph direction. Or it’s nice to be able to select other numeral systems, or mess with the character directionality of parentheses, or handle cantillation marks or niqqud or whatever. If you never need to do any of that, then you don’t need the English (Hebrew) version installed.