Thank you Thilo, for your insight thoughts.
Nevertheless, there are some arguments lacking:
URL: An internet reference is not only practical for literature, but mandatory in many cases. Assume that you have a reference like this:
@Misc{Breasted1930a,
author = {James Henry Breasted},
organization = {The University of Chicago Press},
title = {The Edwin Smith Surgical Papyrus},
date = {1930},
}
How do you check this source? Certainly, your library does not supply this. You have to ask the New York library for the original or a copy, which you will not get because it is an antique.
Therefore, if you do not need this source really badly, you will not check it.
However, if you also get the URL
url = {https://web.archive.org/web/20141014155705/https://ceb.nlm.nih.gov/proj/ttp/smith_home.html}
By this, the case becomes completely different. In general, this is the case for all sources. Nowadays, if you do not find the primary literature in your library and you are only interested in new developments, without an URL you will only reference the old sources, but you will not read them.
Better citations by details: Certaily, the more details you have, the better is the citation. Nevertheless, redundand details are not necessary. If you want some specific details like a page number or a minute in a video, you better do not add it as a special entry type, but use it in an option of the \cite command.
Use all details by special entry types: Using many special entries is not the best answer to the problem of accurate citation. Often, the meta information of web sites contain erronious information already. This can not be automated without an AI approach. Therefore, I prefer to check the information extracted by JabRef manually, correct it and normalize it to the Misc Entry type.