Just to add, there was some discussion of implementing these as plugins rather than in the main library, which allows for further flexibility of the mobject. But I'm not for nor against anyhow.

Isn't this sort of implementation just a quick fix? It doesn't really solve the underlying problem of Tikz not being rendered properly.

Isn't this sort of implementation just a quick fix? It doesn't really solve the underlying problem of Tikz not being rendered properly.

That is a very good point!
But we should at least add the workaround to the documentation while this hasn't been fixed.

Isn't this sort of implementation just a quick fix? It doesn't really solve the underlying problem of Tikz not being rendered properly.

That is a very good point! But we should at least add the workaround to the documentation while this hasn't been fixed.

Might be a good idea to add this to the documentation for newcomers

As discussed here you need to add fill_opacity=0, stroke_width=3 to the Tex constructor for tikz to look like this: and not like this:

This should be put in a new MObject.

It seems that the tex mobject will generate the svg of Tex in \media\Tex file. So I copy the temp file and use SVGMobject to load it. Might not be a good solution, but it works.