Thank you for your feedback.
We alert on things which are required elements for our software to run (i.e. PHP, MySQL, file permissions, etc..). However, actually supporting them is a whole other matter and depending on the server configuring can vary drastically. Our support is limited to stating "your server administrator needs to assist you with requirement x" or "this may be an issue with your server configuration due to y" as our alerts do and maintaining the server is up to a qualified server administrator to take that knowledge and move forward.
This is common of software and pretty much everything in our world. I had an issue with my dryer last week, called out a repair man and after some troubleshooting, it turned out that my house wasn't providing it enough voltage to the socket so I had to call out an electrician. I didn't expect the dryer repair man to fix or tell me how to exactly fix my electricity issues 🙂 . The dryer repair man is an expert in driers, just as we are experts in our software. The underlying items have their own expert(s) which need to attend to those.
mod_security is not a required part of our software and it is on the decline for many hosting providers to be using it. While, we strive to provide the best experience to our users, it isn't possible to provide a warning for all possible modules out there. However, I will bring this up internally.