Even for a web service, imagine a small feature is causing the app to crash to OOM, or too many file handles or something that will take out the whole process a

Even for a web service, imagine a small feature is causing the app to crash to OOM, or too many file handles or something that will take out the whole process and not just the one request. If you have long running requests (something beside small rest calls like large data transfers) then any being served by that same process are taken down.