A reverse proxy is handy to have even in the presence of a VPN. There are still some applications with thoroughly outdated SSL stacks that are difficult or impossible to secure, for example. A reverse proxy can terminate these connections over a privileged local management network, and accept client connections using a more modern encryption scheme (and even add multi-factor authentication if required).
As others have said though, if you're happy to continue using a VPN to access your self-hosted services, in principle there is no problem with doing so.
A reverse proxy is handy to have even in the presence of a VPN. There are still some applications with thoroughly outdated SSL stacks that are difficult or impossible to secure, for example. A reverse proxy can terminate these connections over a privileged local management network, and accept client connections using a more modern encryption scheme (and even add multi-factor authentication if required).
As others have said though, if you're happy to continue using a VPN to access your self-hosted services, in principle there is no problem with doing so.