After reading all this, the importance of a firewall becomes clearer. However, the question may still arise whether it is necessary to invest in one and if the native solutions of the operating systems are not enough.
It is possible to configure a solution like this for corporate use, but embedded firewalls are usually generalist and intended for personal use. To have more control and performance in the detection of threats and actually transform this monitoring into information security intelligence, you need to invest in a specialized option.
After all, a firewall cannot be treated as a secondary component of data protection. It is the front line and, at the same time, the last resort for containing attacks.
Even with all the dedication and attention of an IT team, the number of attacks on companies is so great that it is difficult (or even impossible) to completely shield an environment. In such cases, what matters is quick action to contain the threat and prevent data compromise. And isn't it that the firewall also helps at that time?
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The tool can identify an anomaly in access immediately, something that not even antivirus can in some cases. Alerted about the origin and cause of a breach, IT can act as soon as possible and reject the attack before it has access to important assets.