There's an increasing tendency among a wide range of Security Vendors to using Windows firewall. Trend Micro, Emsisoft, Avira, and F-Secure are on that list. Emsisoft had their own Firewall until it was discontinued in October, 2017. F-Secure did the same and is now relying on Windows Firewall. Trend Micro have there Firewall Booster component and, though it runs separately from Windows firewall and activating it does not activate Windows Firewall, it is not sufficient alone. We still see some big names in Antivirus industry like Kaspersky, Norton, Mcafee, Bitdefender, and Dr.Web still develop their own Firewall module. Third-party firewalls are easier to configure unlike the complicated Windows firewall. My question is if Windows Firewall is sufficient enough and offers great protection as some vendors claim, why do some companies still develop their firewall modules? Isn't this a waste of resources? Moreover, some programs are able to allow themselves through Windows Firewall like uTorrent for instance. If a malicious programs tries to modify Windows Firewall or even turning it off, will, if I may say, Trend Micro, Avira or F-Secure detect such behaviour?