They do mean you're locked into a particular vendor and might have to deal with that device not getting updates in the future. However, you can eventually make your own hardware firewall ...
Physical firewalls are hardware-based devices positioned at the network’s edge. A virtual firewall is software-based and operates in virtualized environments, such as cloud infrastructures ...
This protects you at the network level, meaning all devices are tucked behind the firewall. These can be software, cloud-based, SaaS (software-as-a-service), or even an actual hardware-based firewall ...