If you insist on running untrusted executables and refuse to fix that problem, then you're screwed and antivirus doesn't change that. It's plausible AV will increase the amount of time your system is usable between reinstalls, but that is not security.
Not sure what you mean by coverage here. It doesn't make you more secure, but if your objective is to keep an insecure fleet kinda operational, it might make sense... We're talking about turd polishing though ;-)
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