Make zoom per terminal window
I realize this might not be the original intention, but creating a bug about it anyway.
In the past, the only reason I ever "zoomed" in a terminal was to show someone something in the terminal (e.g. across the table, or via a screen casted presentation), but now with the zoom feature being global and persistent, that becomes much less desirable, as it'll potentially mess up other terminal windows.
If common preferences will include configuring a font, this could mean the terminal "zoom" feature can be changed to be less drastic, i.e. only affect that terminal window without being remembered.
This is also how e.g. Firefox handles zooming.