Just as the title says: is it appropriate to reword questions to make them more generic?
I've seen a lot of questions that ask the same thing; however, the titles aren't related and the average user might not know how to search for them. It reminds of this Alice in Wonderland quote:
“Would you tell me, please, which way I ought to go from here?" "That depends a good deal on where you want to get to." "I don't much care where –" "Then it doesn't matter which way you go.”
If people don't know what their problem is then how can they search for it?
A set of questions that comes to mind is: Cant boot to Kali linux, My windows disappeared from grub after I installed Fedora and Cannot boot Linux Mint after installing Windows (First) and Linux Mint (Second). All of these questions are about the same thing: a messed up bootloader where an entry is not showing at start up.
If you read the other first two questions listed, it doesn't seem that the askers know what they really need help with. They may have an idea, but aren't certain how to go from there.
Can I rephrase the third question as: "I just installed linux and can no longer boot to windows" and hope someone marks it for community wiki?
I think if I were to do that then when a user is typing in their title it'll pop up. It assumes that people search for their question first and pay attention to suggestions, but it might help.
The alternative is to write a new question and with the purpose of having it be community wiki owned so the original asker doesn't lose reputation.
Let me know which would better suit the community.