I too am dealing with 100s of notes that have residue font settings I wish to wipe out. Font settings include not only font, but also color, highlighting, size, etc.
I am looking for a stamp to Strip-All-Formatting from $Text. The stamp would nuke everything, including highlighting, colors, underline, boldface, fonts, etc. I see piecemeal solutions, e.g., resetting font to Standard Font using Format -> Style -> Standard Font (Cmd+Opt+Ctrl+T).
I am not suggesting any sort of fundamental change to how $Text is handled in TBX. I specifically am avoiding the topic of RTF vs plain text vs markdown as some sort of default for $Text. That is a complicated topic that I suspect does not have one-solution-fits-all.
I am just looking for a way to “reset” all font features in $Text without having to go through the onerous manual method outlined here. The reason for a Stamp or equivalent is so that it could be applied to many notes at once.