But at that point you're basically just objecting to all delivery food ever. Which is fine but, like, you are aware that it is a huge industry and has been for decades and people do like it? Convenience trumps artistry (and optimum temperature) for many people a lot of the time.
"To me this ruins the meal"
shrug, I'm not sure what you're expecting anybody to say. I can't really change your mind on what is hypothetical situation for you. I've ordered plenty, it's generally no worse than the quality I would get in the restaurant (other than the presentation in a bespoke takeaway box not a plate).
Also, what kind of presentation are you expecting for a burger anyway? It's a burger, with some artfully surrounding chips? Ordered to go, it's a burger, with the chips in smaller box instead of surrounding the burger.