One thing I hate about OpenVPN is its not really an Open standard, and more Open Core then open source. This is probably the reason its not included by default

One thing I hate about OpenVPN is its not really an Open standard, and more Open Core then open source. This is probably the reason its not included by default in a lot of OSs whereas macOS, iOS, and I think Windows all have built in support for IPSEC. Yeah you can download an app, but there is no really good (free or paid) app for mac and the official iOS client sucks.