I feel like you’re forgetting about subnetting and default gateways. You can’t just route to an internal host if there isn’t a route. That route, if designed correctly, will be behind a firewall that has things subnetter to default deny all for anything “internal” that shouldn’t be publicly routable.

You’re not going to bring up the sensitivity arguments? Foreskin is a natural part of the body, the fact that it’s the norm is meaningless. If we were chopping off the tips of ears or male nipples would there be “no downsides” either? Why not just NOT do the thing? You can’t undo a circumcision.