I thought the same thing on first glance. However, maybe the use case for this is rather to filter entire blocks of solid color text. One complex (red) sentence every now and then is perfectly fine, but I would rather see a whole paragraph of them, say 4 or so in a row, as a problem.
I just cannot stand having "errors" highlighted in red, so my tendency will be to feel bad for not correcting every one. It breaks my heart to see compiler warnings, even if I know that those specific ones are ok...
Maybe is just me, but it will be conflicting for me, and potentially not useful...
