Quotation marks in filenames. Can they mess with quotation marks in shell code?

As far as I know, a safe and portable filename can consists of aA-zZ 0-9 hyphen and underscore only. At the same time, if we move away from the safe file-naming practices, we can use characters such as ! ? $ % " ' / and so on. My question is about quotes, that is, " and '. Isn't it they are more dangerous than, for example, $ or /? For example, if a filename contains spaces and we need to copy such a file, we would enclose its name quotes: cp "file with spaces" folder_without_spaces And because of this, I question myself: Isn't that quotes in a filename can mess with quotes in shell code sometimes? For example, you have

aaa aaa ccc.txt
aaa "xxx" ccc.txt

and then you use

for f in *.txt; do mv "$f" backup_dir; done

and then "Bam!" - something broke. Nothing is broken actually in this particular example (at least on Zsh), but I hope you understood what I mean.