Micropatching Brings the Abandoned Equation Editor Back to Life (2018) (blog.0patch.com)

It's quite a sad story, when people working in Microsoft used to be the experts of all experts on Windows, and at the present moment people from outside know Windows better... It seems like the only people left in there are maintainers...

I just wished there could be something easy to replace this equation editor, it's really smooth for people that are not really proficient with LaTeX

The version Microsoft used is discontinued. However, you can just buy a license of the new product.

https://www.wiris.com/en/mathtype/