It's not so easy to setup. I mean: it's easy but it hits some real world constraints.

Example 1. I run Blockada on my Android phone, so I can block every ad even in apps and I can more or less firewall them (the outside calls). Blockada runs as a local VPN and unfortunately Android allows only one active VPN. So it's either Blockada or Wireguard. I'm with Blockada but I might occasionally want to disable it and enable Wireguard. I never did it yet because:

Example 2. WireGuard does not run everywhere. My little home ARM based server has a Linux kernel with some special driver to manage its hardware (it's pretty common on non-Raspberry ARM devices) and WireGuard does not run on it. It requires a newer kernel that I still cannot upgrade to and maybe I will never be able to. So I don't have anything to VPN to.

I might eventually put online a Raspberry, even an old model 3, as a bastion host on the home end of the VPN, but then it would be something else to care about and to power. It's not worth the mind share and the wattage so far.