The problem is, if you do a lot of formula writing in a narrative, most WYSIWYG editors that support LaTeX formula rendering are just not efficient. I want to type my thoughts, start a formula block, write my expression, end the block, and continue going. You can't do that in most WYSIWYG editors.

You can definitely do that in Typora (unless I miss something what exactly you meant).

When I think of WYSIWYG editors, I see presentation and content being mixed.

Unless Typora has figured out how to get remove the need to locate the insertion point of a formula, open an editor, then submit the data to render an image that is placed inline or made into a block. If it has figured that part out then props to them for making it easier to write mathematics in an accessible editor.

For formulas it just re-renders formula as you type it, no WYSIWYG magic where it's over-complicated. For regular Markdown it's WYSIWYG.

I just wanted to thank you for this discovery.

I am in the middle of writing a document and gave Typora a try, seems to fit the middle ground between "basic" formatting and Latex.