@FreelanceWriter
".........US Law, History, and Psychology. Meanwhile, I've written (literally) thousands of Nursing projects, ~200 UK and Euro Law projects, and hundreds of projects in (each of) Marketing, Education, Communications, Philosophy, and many other project areas; and also dozens of projects in Engineering, Aviation, Zoology, etc. In fact, I just took on a 12K-word dissertation in Dentistry, today".
Students can make up their own mind whether they want to use a writer who announces he can write on just about every topic going. Making unsubstantiated claims is easy and we can all do that on this and other forums.
Your so-called logic misses the point entirely. My analogy is perfectly reasonable.
Writing in an area in which you have no qualification or experience is akin to my reference to a car mechanic and landscape gardener. Your attempt to justify a Jack of all trades and master of none is without merit. The art of writing is important but more crucial is a knowledge and understanding of the topic. If you are not familiar with the subject and not studied it in depth you should not be writing essays.
Your Mercedes versus Toyota analogy is relevant if a writer has a history Degree and chooses to write a history dissertation at Master's level. Although the writer does not have the depth of knowledge required for Master's level, he/she at least has the foundation of relevant knowledge in the subject area. Consider it hill walking at graduate level progressing to mountaineering at Master's level.
Legitimate UK essay companies would rightly restrict you to writing on US Law, History and Psychology.
So students reading this and other posts can decide whether they want to risk using a USA based writer who appears able to write on any topic or a UK one who writes on the topic in which they have a qualification.