@Crumbly Writer
This one always annoys me, "heated up".
I found this interesting article on answering the question: "Q: How did 'heat up' replace 'heat' in referring to heating food?" at https://grammarphobia.com/blog/2019/05/heat-up.html
A: "Heat up" hasn't replaced "heat" in the kitchen, but the use of the phrasal verb in this sense has apparently increased in popularity in recent years while the use of the simple verb has decreased.
However, we haven't found any standard dictionary or usage guide that considers "heat up" any less standard than "heat" in the cooking sense.
You seem to think that "heat up" is redundant. We disagree.
As you probably know, "up" is an adverb as well as a preposition. In the phrasal verb "heat up," it's an adverb that reinforces the meaning of the verb. (A phrasal verb consists of a verb plus one or more linguistic elements, usually an adverb or a preposition.)
The OED, an etymological dictionary based on historical evidence, doesn't mention "heat up" in that sense, but it cites "eat up," "swallow up," "boil up," "beat up," "dry up," "finish up," "heal up," and many other phrasal verbs in which "up" is used to express bringing something to fruition, especially for emphasis.
That's not the entire answer. I simply copied some paragraphs here.