Losing the inbound routes functionality completes wrecks my use-case for mailgun. I've been using it as a way to have business emails come through a custom domain and then routed to personal email addresses. It actually works well enough as with personal email you can respond "as" the custom domain. I have a tiny startup with a few users that I use the routing to move incoming email to also their own personal address…
If you have any questions, feel free to ask! :)