Sure. But as long as it implements something reasonable, you don't care about the details of how. "Runs version x of this programming language" is generally an easier abstraction to run business functionality on than "it's an x86-compatible computer".

> Now add background tasks or streaming responses or a cron job. Oh, guess what, you have to suddenly care about the options your provider is giving you, or go out and buy some stupid cron-as-service or ssh-as-service because you don't have any control over your infrastructure.

Cron is a terrible model for actually solving business problems with. Do you know what happens when a cron job fails to run/errors out?

Running your own unix system gives you a bunch of options that a higher-level abstraction doesn't, sure. But those options are rarely worth the cost, IME. (And like I said, if you're actually getting a unique value-add from running the whole server, then do it!)

> And now suddenly your infra is way more complicated than mine. I am still one that single dockerfile.

I guarante you that anything Docker-based is more complicated than what I'm doing. Docker is the worst kind of layer; it doesn't provide a consistent abstraction of its own, you still have to know all the ins and outs of how the unix system it's running on works, it just adds a whole bunch of extra concepts on top that you have to learn. And then sometimes breaks the usual rules of the platform it's running on as well! (e.g. silently bypassing your iptables rules).

> In fact I am wracking my brains right now to come up with anytime I had a problem because of having a server and coming up short.

- Your program runtime crashing because of mismatched system library ABIs

- A dependency you didn't expect is suddenly available because it got installed by the base system

- /var filling up because of out of control logs or the like

- Any other disk filling up for whatever reason

- Log collectors going AWOL

- Directory traversal order differing because two servers are using different filesystems

- Upgrade changed the network management commands and now all your traffic is being blocked

- Buggy RAID controllers

- Thermal throttling kicking in when it shouldn't because of a broken temperature sensor

- Power outages

All this stuff still needs to be fixed, but it's great to have it be someone else's problem and get on with your program.