"Microsoft AV products" aren't exempt from breaking things with poorly implemented features. MSE on Windows 7 makes games (specifically, fresh installs of StarCraft II, CS:GO and Overwatch) unplayable for me due to CPU usage spikes, apparently due to it thinking that various game executables and settings files are suspicious. Exempting the directories from scanning and disabling suspected malware sample submission had no effect, what finally worked was switching to school-provided Sophos Endpoint. Antivirus can get messy and intrusive no matter who does it.
The thing is most anti-malware products cause perf. issues, but it seems to be the 3rd party ones that actually make your security worse with poorly implemented and secured features. It seems bizarre to me that commercial paid for security products have such poor coding practices that a lone (albeit very talented) researcher can find so many dangerous security vulnerabilities in them.
These vendors should be leading the way in secure coding and design due to the high-privilege level their code runs at.
