I can not confirm this at all. Yes, initial setup can be a hassle, but after that, my experience is that deliverability mostly depends on the content you send,

I can not confirm this at all. Yes, initial setup can be a hassle, but after that, my experience is that deliverability mostly depends on the content you send, not the MTA or its configuration (you should have SPF, DKIM etc. in place, of course). However, if you also need (semi-)automated bounce handling (as in, automatically unsubscribe hard bounces), then yes, you probably shouldn't roll that yourself. But I don't really consider that to be MTA-related stuff.