The question title filter prevents you from writing "Question about ..." which is a good feature in my opinion, though a controversial one. How about forbidding "doubt about" as well, which is used similarly?
The phrase/words have to be used frequently for it to be an issue.
A handful of questions here and there with some generic phrase in the title can be resolved more efficiently with community moderating than using up precious resources via scripts.
Out of 9 million questions on Stack Overflow, there are only:
Is there is a specific site which has a more substantial problem with this?
If so it would likely be worthwhile asking on that site's Meta where users are familiar with the site activity.
You also have to be careful not to isolate genuine usage.
Consider the following question:
I have doubt about this MySQL query being secure
It's not a particularly great title, but it's not terrible either, and I don't think changing only "doubt about" would bring about any particular improvement.
Without "doubt about", people would just use "I don't think this MySQL query is secure" "is this MySQL query secure" etc.
In contrast, this is valid to be filtered, and I don't think it is "controversial" really.
It's quite generic and can't be used legitimately in any scenario I can think of without it being entirely obsolete.
The fact a user is writing a question means it's a "question" and is "about" something.