@AtrusRiven I experimented with 2 more monospaced fonts, Space Mono and MonoLisa, which are both also very pleasant fonts to use. I have a slight preference now for the latter because of how it renders certain symbols.
Whether Monaco is not a pure monospaced font might be true because, although better than variable width fonts, I found it not quite a pleasant as Space Mono and MonolLisa.
I find that when I use one of the monospaced fonts my eyes do not hurt anymore at the end of a day. I find them a lot more calming because the letters are wider spaced from one another, and consistent.
With a variable width fonts I find I have to make more of an effort to read, even having to squint a bit at times.
I used to hate monospaced, and whenever an Obsidian theme I tried out had a monospaced font for Edit mode, I used to change it immediately to the variable width font of Preview - also for the WYSIWYG experience. I now do the inverse: MonoLisa for both Edit and Preview.
Be that as it may, most people will disagree with me, much preferring a variable width font any time.