Is strict adherence to a citation format really necessary in actual research?
First of all, almost nobody formats their references by hand. Typesetting systems such as Latex have a tool for auto-generating references, for instance from a bibtex file (which is essentially a local database of papers that the researcher often cites). Entries into this file are also not really manual in most cases, as bibtex entries for papers can usually be obtained via a quick web search from the publisher. For instance, in the ACM Digital Library (see example entry here), you can click on the right-hand side on Export -> Bibtex and obtain a bibtex entry. Other typesetting systems, such as Microsoft Word, usually have similar plugins or features.

Now, why would your English teacher (or publishers) even care about whether you write Thomasz Antonie or T. Antonie (or Antonie, T., ...)? At the end of the day, this is not so much about understandability of the reference, but more about giving the paper a more professional look-and-feel. For journals it is important to retain their "trademark" optics. This includes obvious aspects, such as font size, column layout, or margins, but also extends to using a consistent reference style within each paper, and also across papers published in the same journal.